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Academic literature on the topic 'Gas chromatograph detector'

Author: Grafiati

Published: 7 June 2025

Last updated: 9 July 2025

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Journal articles on the topic "Gas chromatograph detector"

1

Arzu Ibragimova, Arzu Ibragimova. "BENEFITS OF USING A FID TO MEASURE THE MULTICOMPONENT GAS MIXTURES." PIRETC-Proceeding of The International Research Education & Training Centre 27, no. 06 (2023): 131–39. http://dx.doi.org/10.36962/piretc27062023-131.

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The development of the oil and gas complex is one of the priority areas of the Azerbaijan economy. Oil and gas are among the most competitive Azerbaijan goods and are in high and stable demand from global consumers. Therefore, increased attention is paid to product quality. One of the methods for quality control of petroleum products is gas chromatography. Today it is a widely used physical and chemical research method. The capabilities of a gas chromatography are mainly determined by the enormous separating power of the chromatographic columns and the characteristics of the detectors. If the chromatographic column is sometimes called the heart of the chromatograph, then the detector can be called the brain of the chromatograph [1,2]. Effective development of an analysis technique, its successful implementation, troubleshooting of a chromatograph, and metrological certification are impossible without the ability to make the right choice of a detector, operate it competently, and correctly interpret the detector signal. About 50 detectors have been proposed for gas chromatography, but only a few of them are used in practice. The most used are the flame ionization detector and the thermal conductivity detector. The article shows the advantage of using a flame ionization detector to measure important physical and chemical properties, such as density, caloric content, the ratio of the number of carbon atoms to the number of hydrogen atoms C/H. Keywords: Chromatography, gas-mixture, density, hydrocarbon, heat of combustion, calorific value, flame ionization detector, number of carbon atoms, sensitivity, quality.

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Jitender, Kumar, Kumar Vinod, Kumar Singh Vinay, et al. "GC-SAW and GC-FID performance comparison for fast analysis of volatile organic compounds." Indian Journal of Science and Technology 13, no. 48 (2020): 4672–78. https://doi.org/10.17485/IJST/v13i48.1611.

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Abstract <strong>Objectives:</strong> To develop gas chromatograph (GC) based chemical agent detector and to compare the response of Surface Acoustic Wave (SAW) detector with Flame Ionization Detector (FID) for the development of a reliable and fast gas/vapour analyzer. Also, to describe the limitations of the FID over SAW detector.<strong> Methods:</strong> An uncoated 433.92 MHz SAW device was used as Gas Chromatography (GC) detector and its response was recorded and compared with conventional FID detector using short capillary column. The response of both the detectors were analyzed by using standard mixture of seven Volatile Organic Compounds (VOCs). Besides this comparison various key parameter of GC i.e. Flow, temperature and length of GC column were also optimized for fast GC analysis. <strong>Findings:</strong> After analyzing the fast GC data of both the detectors with same sample, it was observed that the resolution of chromatograms with SAW detector showed more resolved peaks as compare to the FID detector for the same GC parameters. <strong>Improvements/Applications:</strong> It is concluded that the SAW detector is more suitable for fast and reliable analysis of chemical vapors in rapid analysis. <strong>Keywords:</strong> Gas chromatograph detector; surface acoustic wave; volatile organic compounds

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Shkurdoda, S., D. Shynkarenko, V. Pasichnyk, K. Korol, and O. Posilskyi. "EXPERT STUDY OF ISONIAZIDE IN MEAT PRODUCTS." Criminalistics and Forensics, no. 66 (2021): 785–99. http://dx.doi.org/10.33994/kndise.2020.66.57.

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The article deals with the recommendations for the detection of isoniazid in meat products, using the example of minced meat using physicochemical methods. This study does not lose its relevance over the years, due to the use of drugs for tuberculosis for poisoning homeless and domestic animals, in particular dogs, in different regions of Ukraine, the main active ingredient of which is isoniazid. The article describes a method for the extraction of isoniazid in food products of meat origin (minced meat, sausage), which presumably could or may be used to poison domestic animals, in particular dogs. Isoniazid was identified by the methods of qualitative color reactions, thin-layer chromatography, and gas chromatography with a mass-selective detector. The process of qualitative identification of isoniazid in foodstuffs that could or may be used to poison domestic animals, in particular dogs, includes: -the method of extraction and separation of interfering impurities, primarily fats, preliminary research by the method of qualitative analytical reactions; -studies by thin layer chromatography; -research by instrumental methods, in particular, gas chromatography with mass-selective detection. The method for extracting isoniazid from meat products described in the article is effective and allows you to get rid of interfering substances, especially fats. In addition, the method of gas chromatography with mass-selective detection has sufficient sensitivity and selectivity. It allows with a minimum number of interfering peaks of low intensity, determine the composition of isoniazid accurately. The specified list of instrumental base, methods and research techniques is not exhaustive. The examiner should be guided by the availability of relevant literature and the availability of appropriate analytical equipment (gas chromatograph, gas chromatograph with mass-selective detector, liquid chromatograph, liquid chromatograph with mass-selective detector, etc.). In accordance with this, it is necessary to use certain methods for studying substances. These methods are subject to mandatory verification before being used in the laboratory. The obtained research results allow us to recommend this technique for implementation in expert practice.

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Yatsenko, Larisa Anatolyevna, Maria Yurevna Printseva, Ilya Danilovich Cheshko, and Artur Alexandrovich Tumanovsky. "Detection of residues and determination of the composition of combustible components in case of explosions of vapor-gas-air mixtures." Technology of technosphere safety 97 (2022): 51–60. http://dx.doi.org/10.25257/tts.2022.3.97.51-60.

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Introduction. Liquefied hydrocarbon gases (LHG) are widely used in various fields. The main components of LHG are: propane, isobutane and n-butane, which are not only combustible, but also explosive gases capable of detonation combustion. The detection of LHG in the air is a very urgent task in expert studies. To determine the component composition of various flammable liquids, for the purpose of their identification, chromatographs equipped with a capillary quartz column with a phase that allows detecting saturated hydrocarbons of the homologous series from pentane to pentatetracontane inclusive are used in the Forensic Expertise Institutions of Federal Fire Service of EMERCOM of Russia. However, it is not possible to analyze the component composition of lighter hydrocarbons according to the previously proposed and used in expert practice method for detecting and studying flammable liquids/high liquids under these conditions. To solve the problem of unification of the use of the instrumental base for the detection of residues of flammable liquids, liquid liquids and light hydrocarbons, new chromatography conditions were selected using the existing equipment set. Goals and objectives. The aim of the study is to select the analysis conditions for detecting the remains of liquefied hydrocarbon gases after explosions of steam-air mixtures on the basis of the instrumental gas chromatographic complex in service with the Forensic Expertise Institutions of Federal Fire Service of EMERCOM of Russia. Research methods. To detect and determine the composition of residues of combustible components during explosions of vapor-gas-air mixtures, a hardware-software instrumental complex based on a gas-liquid chromatograph equipped with a flame ionization detector, a ZB-50 capillary column, and an attachment from a two-stage thermal desorber was used. Results and its discussion. In the course of the study, the optimal conditions for conducting gas chromatographic analysis were defined and selected in order to detect liquefied hydrocarbon gases. Recommended pressures are given for various carrier gases. It is shown that, by varying the pressure and inlet temperature, light hydrocarbons propane, butane, isobutane is fairly well separated on a gas-liquid chromatograph with a flame ionization detector and on a ZB-50 capillary column 30 meters long. Conclusion. The research shows that the problem of combining a hardware-software instrumental complex based on a gas chromatograph with an attachment from a two-stage thermal desorber used for the analysis of two groups of substances (liquefied hydrocarbons and flammable liquids, gas liquids) is solved by varying the pressure and temperature of the input. Keywords: gas-liquid chromatography, thermal desorption, liquefied petroleum gases, light hydrocarbons, air-fuel mixtures, vapor-gas-air mixtures, explosion, fire examination.

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Hammack, Walter, Mary C. Carson, Barbara K. Neuhaus, et al. "Multilaboratory Validation of a Method To Confirm Chloramphenicol in Shrimp and Crabmeat by Liquid Chromatography-Tandem Mass Spectrometry." Journal of AOAC INTERNATIONAL 86, no. 6 (2003): 1135–43. http://dx.doi.org/10.1093/jaoac/86.6.1135.

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Abstract An existing method for chloramphenicol (CAP) determination in shrimp using a gas chromatograph with electron capture detector was adapted for confirmation of CAP with a liquid chromatograph interfaced to a triple quadrupole mass spectrometer. CAP residues are extracted from tissue with ethyl acetate, isolated via liquid–liquid extraction, and concentrated by evaporation. Extracts are chromatographed by using a reversed-phased column and analyzed by electrospray negative mode tandem mass spectrometry. Four product ions (m/z 152, 176, 194, and 257) of precursor m/z 321 were monitored. Moving from gas chromatography to liquid chromatography–tandem mass spectrometry improved the sensitivity of the method greatly, enabling reliable confirmation of CAP residues at 0.3 μg/kg (ppb). The method meets confirmation criteria recommended by the U.S. Food and Drug Administration and 4-point identification criteria established by the European Union. With slight modifications to accommodate different equipment, the method was validated in 3 laboratories.

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Zharov, V. P., and S. G. Montanari. "Capillar Gas Chromatography With Laser Optothermal Detection." Laser Chemistry 5, no. 3 (1985): 133–42. http://dx.doi.org/10.1155/lc.5.133.

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The design of a through-flow laser opto-thermal (OT) detector intended for operation as a selective chromatographic detector in combination with capillary columns is described. The main advantage of such a detector is its relative simplicity and high spatial resolution. A new differential scheme of OT detector which can reduce the background signals of scattered radiation by about 102 times is suggested. The threshold sensitivity of OT detector is experimentally estimated to be equal to about 7 ng (ethanol). The higher selectivity of the developed system “gas capillary chromatograph + laser OT spectrometer” has been demonstrated by analyzing a mixture of five atomatic hydrocarbons with the use of a tunable CO2 laser. Recommendations for further modification of the equipment are given.

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He, Zilan, Qingsha Hang, Baiquan Chen, Bangfa Chen, and Sixiang Chen. "MEMS-based Sensing Technology for the Gas Chromatograph Analysis." Journal of Physics: Conference Series 2479, no. 1 (2023): 012003. http://dx.doi.org/10.1088/1742-6596/2479/1/012003.

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Abstract Device miniaturization based on MEMS technology is an important research direction in the field of MEMS. The gas chromatograph is a commonly used instrument for detecting complex gases, but due to its large size, high power consumption, and heavyweight, it is not convenient and cannot meet people’s needs for real-time, online, and rapid access to information. Therefore, the miniaturization of gas chromatographs combined with MEMS technology is a research trend. This paper first introduces the basic structure of the gas chromatograph. Then it studies the miniaturization of columns, detector miniaturization, and flow meter miniaturization based on MEMS technology, combined with cross-micro-nano scale integration technology to further improve sensitivity, and summarizes the prospects.

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Dobrokhotov, Vladimir, and Alexander Larin. "Multisensory Gas Chromatography for Field Analysis of Complex Gaseous Mixtures." ChemEngineering 3, no. 1 (2019): 13. http://dx.doi.org/10.3390/chemengineering3010013.

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A novel approach to analysis of complex gaseous mixtures is presented. The approach is based on the utilization of a compact gas chromatograph in combination with an array of highly integrated and selective metal oxide (MOX) sensors. Thanks to the implementation of a multisensory detector, the device collects multiple chromatograms in a single run. The sensors in the integrated MEMS platform are very distinct in their catalytic properties. Hence, the time separation by chromatographic column is complemented by catalytic separation by a multisensory detector. Furthermore, the device can perform the analysis in a broad range of concentrations, from ppb to hundreds of ppm. Low ppb and even sub-ppb levels of detection for some analytes were achieved. As a part of this effort, nanocomposite gas sensors were synthesized for selective detection of hydrogen sulfide, mercaptans, alcohols, ketones, and heavy hydrocarbons.

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Fiddler, Walter, Robert C. Doerr, and Robert A. Gates. "Gas Chromatographic Method for Determination of Dimethylamine, Trimethylamine, and Trimethylamine Oxide in Fish-Meat Frankfurters." Journal of AOAC INTERNATIONAL 74, no. 2 (1991): 400–403. http://dx.doi.org/10.1093/jaoac/74.2.400.

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Abstract A method Is described for analysis of minced fish-meat and surlmi-meat frankfurters for dimethylamine (DMA), trimethyiamine (TMA), and trimethyiamine oxide (TMAO) using a headspace-gas chromatographic technique. After simple acid extraction and addition of NaOH, the headspace was directly Injected Into a gas chromatograph by a gas-tight syringe. DMA and TMA were separated on a Chromosorb 103 column and detected by a flame Ionization detector. TMAO was measured as TMA after Zn reduction. Repeatability of the method for DMA, TMA, and TMAO was 6.6,1.0, and 18.8 ppm, respectively. The method was applicable to Alaska pollock-meat and Atlantic menhaden-meat frankfurters, unwashed, and washed mince and surlml.

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Kataev, S. S., O. N. Dvorskaya, M. A. Gofenberg, A. V. Labutin, and A. B. Melentyev. "ANALYTICAL FEATURES OF SYNTHETIC MDMB(N)-073F CANNABIMIMETICS AND ITS MARKERS IN BIOLOGICAL MATERIAL." Pharmacy & Pharmacology 7, no. 4 (2019): 184–97. http://dx.doi.org/10.19163/2307-9266-2019-7-4-184-197.

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The aim of the research is to study both analytical features of synthetic MDMB(N)-073F cannabimimetics of indazole carboxamides group by gas chromatography methods combined with tandem mass spectrometry (GC-MS) and high performance liquid chromatography with high-resolution mass spectrometry (HPLC-HRMS) as well as characteristics of the major MDMB(N)-073F metabolite, its glucuronide and derivatives, using gas chromatography with mass-spectrometric (GC-MS) detection and high-performance liquid chromatography (HPLC) with MS/MS mass spectrometry (HPLC-MS/MS) in urine samples to be applied in expert practice, chemical-toxicological and forensic and chemical analyses.Materials and methods. To carry out the study, the following materials were used: plant-based objects with narcotic drugs withdrawn from illegal trafficking and applied to them;. urine samples to be studied under chemical-toxicological and forensic and chemical analyses. For solid-phase epitaxy, SampliQ EVIDEX TFE cartridges – 200 mg – 3 ml (Agilent, USA) were used for sample preparation; β-glucuronidase, Type HP-2, From Helix Pomatia, 100000 UA/ml (Sigma-ALDRICH CHEMI, Germany) was used for enzymatic hydrolysis. GC-MS/MS analysis was made using Agilent 7890 gas chromatograph with a tandem quadrupolar mass-spectrometer Agilent 7000 (Agilent, США); GC-MS analysis was carrid out using gas chromatograph Agilent 7820 with mass-selective detector Agilent 5975 (Agilent, USA); HPLC-HRMS research was made on liquid chromatograph Agilent 1260 with tandem hybrid high-resolution quadrupole-time-of-flight detector Agilent 6540 (Agilent, США); liquid chromatograph Agilent 1260 with Agilent 6460 (Agilent, USA) with tandem mass-spectrometer were used for making HPLC-MS/MS research.Results. The structure of MDMB(N)-073F compound has been confirmed and an exact mass of the protonated molecule corresponding to the chemical formula C19H27FN3O3 fixed by GC-MS/MS and HPLC-HRMS methods. Spectral characteristics of MDMB(N)-073F have been given. One of the branches in MDMB(N)-073F biotransformation in the human body found out by GC-MS and HPLC-MS/MS methods, is the ester decomposition with further conjugation of the resulting acid. The product interacting with glucuronic acid, is found to be the conjugate of major MDMB(N)-073F metabolite of the Ist phase in biotransformation. Metabolites appearing due to the ester decomposition and its conjugate with glucuronic acid, are recommended to be used as markers for synthetic MDMB(N)-073F cannabimimetics in the analysis by chromatographic methods; they can be used for regular screening of biological samples.Conclusion. The research results presented here, are the following: the analytical features characteristic for synthetic MDMB(N)-073F cannabimimetics found out by gas chromatography methods combined with tandem mass spectrometry (GC-MS/ MS) and liquid chromatography of hybrid high-resolution quadrupole-time-of-flight mass spectrometry (HPLC-HRMS), as well as characteristics of major MDMB(N)-073F metabolite, its glucuronide and derivatives with the use of gas chromatography with mass-spectrometric detection (GC-MS) and liquid chromatography combined with tandem mass spectrometry (HPLC-MS/MS) in urine samples to be applied in expert practice, chemical-toxicological, forensic and chemical analyses.

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Dissertations / Theses on the topic "Gas chromatograph detector"

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McBrady, Adam Dewey. "Microfabricated chromatographic instrumentation for micro total analysis systems /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/8570.

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Akbar, Muhammad. "Chip-Scale Gas Chromatography." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56566.

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Instrument miniaturization is led by the desire to perform rapid diagnosis in remote areas with high throughput and low cost. In addition, miniaturized instruments hold the promise of consuming small sample volumes and are thus less prone to cross-contamination. Gas chromatography (GC) is the leading analytical instrument for the analysis of volatile organic compounds (VOCs). Due to its wide-ranging applications, it has received great attention both from industrial sectors and scientific communities. Recently, numerous research efforts have benefited from the advancements in micro-electromechanical system (MEMS) and nanotechnology based solutions to miniaturize the key components of GC instrument (pre-concentrator/injector, separation column, valves, pumps, and the detector). The purpose of this dissertation is to address the critical need of developing a micro GC system for various field- applications. The uniqueness of this work is to emphasize on the importance of integrating the basic components of μGC (including sampling/injection, separation and detection) on a single platform. This integration leads to overall improved performance as well as reducing the manufacturing cost of this technology. In this regard, the implementation of micro helium discharge photoionization detector (μDPID) in silicon-glass architecture served as a major accomplishment enabling its monolithic integration with the micro separation column (μSC). For the first time, the operation of a monolithic integrated module under temperature and flow programming conditions has been demonstrated to achieve rapid chromatographic analysis of a complex sample. Furthermore, an innovative sample injection mechanism has been incorporated in the integrated module to present the idea of a chip-scale μGC system. The possibility of using μGC technology in practical applications such as breath analysis and water monitoring is also demonstrated. Moreover, a nanotechnology based scheme for enhancing the adsorption capacity of the microfabricated pre-concentrator is also described.<br>Ph. D.

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Bagheri, Habib. "Vapour-phase fluorescence detection in gas chromatography." Thesis, University of East Anglia, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280036.

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Ash, Peter William. "Studies of tin oxide gas sensors for gas chromatographic detection." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/2066.

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Gas sensitive semiconductors have been known for many years and applied in static gas alarm systems for the monitoring of hazardous gases, however, their application has been limited by a lack of selectivity. In this work a semiconducting gas sensor has been configured for use as a gas chromatographic detector thus combining the sensitivity of semiconductor sensors with the selectivity of gas chromatography. The study has been confined to tin oxide devices, more specifically the Taguchi gas sensor (TGS) . The majority of this work has concentrated on the TGS 813 although the use of other TGS is described. The development of suitable instrumentation is described and rigorous optimisation of the operating parameters e.g. heater voltage and column temperature has been performed using the variable step size simplex technique. Attention was concentrated on the response of the TGS 813 to hydrogen which was used as a test gas. A novel figure of merit, response multiplied by retention time and divided by skew factor was designed so that optimum response was obtained whilst maintaining adequate chromatographic separation. Optimum conditions were verified by univariate searches and the response was observed to be most dependant upon heater voltage. A limit of detection of 20 ppb v/v of hydrogen in a 1 ml sample was obtained at optimal conditions. Illustrative analyses of hydrogen were performed in human breath and laboratory air with results found to be in close agreement with literature values. Calibration was found to be linear over at least three orders of magnitude. The response of the TGS 813 to low molecular weight alkanes has also been investigated. It was observed that different heater voltage optima existed for each of the C1-C5 alkanes and that the sensor was relatively more sensitive to the higher molecular weight compounds. As with hydrogen linear response was obtained over at least three orders of magnitude and an illustrative analysis of natural gas showed excellent agreement with known levels. A compromise optimum heater voltage was used to study the response of the TGS 813 to alcohols, aldehydes, ketones and some Cs hydrocarbons. Capillary columns were used in this investigation and it was noted that they had potentially wider application than packed columns due to the use of an inert carrier with an air make-up flow to the detector. This replaced the air carrier gas used previously which might degrade certain stationary phases. Three different types of TGS: the 813; 822 and 831 were used in a study of the response and skew factor for the detection of halogen-containing compounds. Very high skew factors were often observed, although, for some compounds it appeared that symmetrical peaks could be obtained within narrow heater voltage ranges. Skewed response was observed to be dependant upon sensor type, heater voltage and halogen proportion and type. Analysis of the three sensor types was performed and differences in potential surface area and tin oxide additives observed. The presence of additives was observed to adversely affect sensor recovery.

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Webster, Caroline S. "Applications of coupled gas chromatography-atomic emission detection." Thesis, Sheffield Hallam University, 1995. http://shura.shu.ac.uk/20507/.

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This thesis describes the evaluation and application of the atomic emission detector as a detector for capillary gas chromatography. Chapter 1 is a general introduction to the technique, describing the development of the atomic emission detector, the theory of its operation, and some of its applications. This chapter also includes a detailed description of chromatography theory. Chapter 2 describes the experimental conditions used throughout the course of this work. Chapter 3 concentrates on compound independent calibration, beginning with a general introduction to the area and a discussion of studies already made. Four groups of compounds were used to determine the ability of the atomic emission detector to perform compound independent calibration. Initial studies with a group of similar hydrocarbons showed little or no compound/structure dependence. However, results from the same study with a group of phenols did indicate some structure dependence for carbon and oxygen, but when chloroanisoles were tested, this compound dependence was not apparent. A group of different nitrogen-containing compounds was then studied. Here structure dependence was observed on all channels, ie carbon, oxygen and nitrogen. It was also noted that the responses became non-linear at higher concentrations. This would normally indicate detector overload, but not in this case as non-linearity occurred to different extents for the same element in different compounds. A study was also made on the effect of discharge tube ageing on response. Clean and dirty discharge tubes were used for the phenols and the nitrogen-containing compounds. The phenol, carbon and chlorine results showed a decreased sensitivity with the old tube, but the oxygen responses were not affected. The same drop in sensitivity was seen with the nitrogen-containing compounds, but here oxygen was also affected. Chapter 4 describes the use of the atomic emission detector and mass spectrometry as complementary techniques. Perfume samples were analysed using both instruments. A comparison of 'real' and 'fake' perfumes was also made. Results indicated that the atomic emission data was useful in deciding whether to accept or reject mass spectral library guesses. Chapter 5 describes the application of the atomic emission detector for the analysis of refinery streams. The use of the 'backamount' correction facility was also effectively demonstrated. Chapter 6 is a general discussion of the instrument including operational problems encountered and possible modifications to overcome these problems. The overall objective of the thesis is to place the GC-AED combination in the context of the commonly used chromatographic techniques.

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Sreedharan, Nair Shree Narayanan. "MicroGC: Of Detectors and their Integration." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/47785.

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Gaseous phase is a critical state of matter around us. It mediates between the solid crust on earth and inter-stellar vacuum. Apart from the atmosphere surrounding us where compounds are present, natively, in a gaseous phase, they are also trapped within soil and dissolved in oceanic water. Further, those that are less volatile do enter the gaseous phase at high temperatures. It is this gaseous phase that we inhale every second. It is thus critical that we possess the tools to analyze a mixture of gaseous compounds. One such method is to separate the components in time and then identify, primarily based on the retention times, also known as gas chromatography. This research focuses on the development of gas detectors and their integration, in different styles, primarily for gas chromatography. Utilizing fabrication techniques used in semiconductor industry and exploiting scaling laws we investigate the ability to improve on conventional gas separation and identification techniques. Specifically, we have provided a new spin to the age-old thermal conductivity detector enabling its monolithic integration with a separation column. A reference-less, two-port integration architecture and a one-of-its-kind released resistor on glass are some of its salient features. The operation of this integrated device with a preconcentrator and in a matrix array was investigated. The more unique contribution of this research lies in the innovative discharge ionization detector. An ultra-low power, sensitive, easy to fabricate detector, it requires more investigation for a thorough understanding and will likely mature to replace the thermal conductivity detector, as the detector of choice for universal detection, in time to come.<br>Ph. D.

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Huang, Degui. "Development of a capacitively coupled plasma as a gas chromatographic detector." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29879.

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This work has two objectives: first, to develop an atmospheric pressure radio frequency capacitively coupled plasma (CCP) as a detector for gas chromatography (GC) and, secondly, to understand the excitation process in the CCP from a fundamental point of view. In the process of developing the CCP as a gas chromatographic detector, the design of a CCP torch useful as an atomic emission detector for GC has involved several stages of evolution. Initially, two plasma torches, a cylindrical one with concentric electrodes and a rectangular one with two parallel electrodes, were designed and their performance evaluated. It was found that the parallel plate torch which utilized a rectangular-bore quartz tube had more stable emission signals, which was attributed to less gas flow turbulence. Therefore the rectangular torch was chosen for further experiments. Another consideration of using the rectangular torch was that it was easier to interface it with a capillary column from a gas chromatograph. With a flow of make-up gas consisting of the plasma gas, the outlet flow of resolved analytes from the GC column was entrained into the discharge. This configuration rninimized the dead volume so that the high resolution provided by the capillary column would not be degraded by the plasma torch volume. One problem encountered in the initial work was that arcing occurred occasionally through air between the electrodes which often damaged the plasma torch even though quartz tubes enclosed the electrodes to isolate them from the air. The reason for this is believed to be due to the high voltage from the power supply. In order to make the torch more amendable to testing, a demountable version was designed such that different quartz tube and electrode dimensions could be evaluated. Also, the operating frequency was shifted from 27.12 to 13.56 MHz. One advantage of using the 13.56 MHz RF power supply was that the electrodes did not have to be enclosed in an insulator and could be exposed to air without external arcing around the outside of the torch because the power supply provides lower output voltage. The torch performance was evaluated for the determination of organotin compounds. One difficulty still encountered, however, was heating of the parallel plate electrodes which yielded unstable plasma conditions at times. As a result, a new version of the CCP torch was designed by utilizing water cooled electrodes. With this configuration and the 13.56 MHz power supply, the electrode could contact the discharge tube directly and the plasma was formed without arcing. The efficiency of power transfer to the plasma was increased significantly. Furthermore, the plasma created was extremely stable. Both metal and non-metal elements could be excited sufficiently using the modified configuration and excellent results have since been obtained. The detection limits for F, CI, Br, I, S, and C were determined to be 10 to 78 pg/s. The fulfillment of the second objective was carried out on the modified water-cooled plasma torch as mentioned above. Spatial distributions associated with the CCP which arise as a result of the transverse power coupling geometry were obtained. Some clues as to possible excitation processes in the CCP have been gleaned from the study of the relative intensities of lines for several non-metals. Basically, electron impact is the major excitation mechanism in the CCP. Excitations by the helium or argon metastables may play very a minor role. Charge transfer excitation reactions were found between He₂⁺ and CO and N₂.<br>Science, Faculty of<br>Chemistry, Department of<br>Graduate

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Ware, Margaret LaVerne. "The Development and Application of a Helium Discharge Detector for Gas Chromatography." W&M ScholarWorks, 1988. https://scholarworks.wm.edu/etd/1539625431.

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Schofield, Paul Anthony. "An investigation of the response mechanism of the nitrogen phosphorus detector." Thesis, Manchester Metropolitan University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300730.

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The Nitrogen Phosphorus Detector is a sensitive, selective device used in gas chromatography. It responds selectively towards nitrogen and phosphorus containing organic compounds with detection limits in the picogram range. The detector is of great importance for the measurement of trace levels of drugs, pesticides and herbicides in biological matrices and the environment. There is, however, some dispute in the literature regarding the detector's response mechanism. The detector is based on a hydrogen-air diffusion flame. Two electrodes polarise the flame with a potential difference of about 200 V and the current through the flame is measured using an electrometer amplifier. The selectivity of the system relies on the presence of an alkali metal source, usually rubidium. In the presence of nitrogen- and phosphorus-containing organics, C~ and PO· anions are formed, yielding a current which is the measured response. It has been suggested that this selective response arises from a charge transfer reaction between the rubidium excited states and ~ or PO· and P02• radicals. Using an AlGaAs diode laser, the rubidium excited state population can be modulated and the influence on detector current monitored. Rubidium resonance-enhanced ionisation, laser-induced fluorescence and emission spectroscopy have all been used to further probe the response mechanism of the detector. Results have demonstrated that during response the C~ radical concentration increases. In addition the diode laser can modulate the excited state rubidium concentration altering it by a factor of 2. However despite more that doubling the Rubidium excited state concentration no increase in detector response is observed. From these observations it has been concluded that the above mentioned charge transfer reaction plays little if any role in detector response.

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Lin, Zhong-Ping. "Gas-phase luminescence of aromatic carbonyl compounds and the design and use of a gas chromatographic detector." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ36559.pdf.

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Books on the topic "Gas chromatograph detector"

1

Bagheri, Habib. Vapour-phase fluorescence detection in gas chromatography. University of East Anglia, 1991.

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Seitz, Charles A. Analysis for impurities in helium using the helium ionization detector. U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Lingeman, Hendrik. Selective pre-chromatographic derivatization methods for carboxylic acids: (high-performance liquid chromatography with fluorescence detection and gas-liquid chromatography with nitrogen-phosphorous detection). [s.n.], 1986.

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Chen, E. C. M. The electron capture detector and the study of reactions with thermal electrons. Wiley-Interscience, 2004.

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Justin, Black, Chen Bryan, and United States. National Aeronautics and Space Administration., eds. "Evaluation of relative sensitivity of SAW and flexural plate wave devices for atmospheric sensing": NCC2-5185. National Aeronautics and Space Administration, 1998.

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Fredericus Josephus Gerardus Maria van Kuijk. Detection of lipid peroxidation associated with retinal degeneration using gas chromatography-mass spectrometry. SSN, 1988.

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Megson, Garry Michael. The Application of gas-liquid chromatography for the detection of fungal polyols in serum. University of Manchester, 1993.

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Ashley, Jason. Analysis of Coumarins and their detection in Galium triflorum using pyrolysis gas chromatography / mass spectrometry. Laurentian University, 1999.

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Harke, Heather Ruth. Evaluation of a new microwave plasma cavity as a mercury and selenium selective detector for capillary column gas chromatography. National Library of Canada, 1990.

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Jha, Virendra K. Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory: Determination of organophosphate pesticides in bottom sediment by gas chromatography with flame photometric detection. U.S. Dept. of the Interior, U.S. Geological Survey, 2003.

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Book chapters on the topic "Gas chromatograph detector"

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Fischer, Hendrik, Jörn Frank, Bert Ungethüm, Matthias Drobig, Andreas Walte, and Gerhard Matz. "Detector Array with Gas Chromatograph for On-Site Analyses." In Communications in Computer and Information Science. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33161-9_35.

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Raal, J. David, and Andreas L. Mühlbauer. "Gas-Liquid Chromatograph Detector Calibration and Chemical Purity Determination." In Phase Equilibria. Routledge, 2023. http://dx.doi.org/10.1201/9780203743621-5.

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Andersson, Jan T. "Detectors." In Practical Gas Chromatography. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54640-2_6.

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Mothes, Sibylle, and Jürgen Mattusch. "Element-Specific Detection." In Practical Gas Chromatography. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54640-2_10.

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Hill, D. W. "Detectors for Gas Chromatography." In Ciba Foundation Symposium - Gas Chromatography in Biology and Medicine. John Wiley & Sons, Ltd, 2008. http://dx.doi.org/10.1002/97804707197019780700014286.ch5.

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Eremin, Sergey. "Immunochemical methods for detection of organophosphorus compounds." In ORGANOPHOSPHORUS NEUROTOXINS. Publishing Center RIOR, 2020. http://dx.doi.org/10.29039/33_219-230.

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Organophosphorus compounds (OP) are found in environmental objects and food products. Due to their high toxicity and inhibition of cholinesterase activity, it is necessary to control residual amounts of OP. The most common methods for determining OP are gas and liquid chromatography with various detection methods. However, chromatographic analysis is lengthy, requires complex sample preparation and expensive equipment, which limits its use for screening a large number of samples and continuous monitoring of the content of OP. To detect the OP, it is necessary to use High Throughput Screening methods, using simple, fast and inexpensive analysis methods. Currently, immunochemical methods are increasingly used to determine OP. These methods are based on the recognition of the analyte (antigen) by specific receptors (antibodies) with the formation of the antigen-antibody complex and the measurement of the analytical signal generated by the immunochemical test system in response to complex formation, which leads to high sensitivity and specificity of the analysis.

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Krull, Ira S., Michael Swartz, and John N. Driscoll. "Multiple Detection in Gas Chromatography." In Advances in Chromatography. CRC Press, 2021. http://dx.doi.org/10.1201/9781003209973-8.

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Snow, Nicholas H. "Next Directions in Detectors for Gas Chromatography." In Advances in Chromatography. CRC Press, 2021. http://dx.doi.org/10.1201/9781003223405-3.

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Rice, Gary W. "Helium Discharge Detector for Gas Chromatography." In ACS Symposium Series. American Chemical Society, 1992. http://dx.doi.org/10.1021/bk-1992-0479.ch012.

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Mohamad, Ahmad H., and Joseph A. Caruso. "Element-Selective Plasma Emission Detectors for Gas Chromatography." In Advances in Chromatography. CRC Press, 2021. http://dx.doi.org/10.1201/9781003209027-5.

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Conference papers on the topic "Gas chromatograph detector"

1

Dougherty, J. A. "Effect of Variables on Downhole Corrosion Inhibitor Application." In CORROSION 1996. NACE International, 1996. https://doi.org/10.5006/c1996-96022.

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Abstract One inhibitor was studied in detail to determine the effect of solvent, temperature, concentration and contact time on inhibitor application. The laboratory corrosion tests used the rotating cylinder electrode and linear polarization to measure the corrosion rate. The corrosion rate was also verified by iron loss measurements. Inhibitor was extracted from the electrode surface and the quantity determined by gas liquid chromatography. The inhibitor was also detected on the surface of the electrode by Fourier Transform Infrared spectroscopy. Corrosion rate data monitored in the field and inhibitor residue on field coupons confirm the laboratory test data.

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Yu, Conrad M., Matthew Lucas, Jackson C. Koo, Paul Stratton, Terri DeLima, and Elaine Behymer. "A High Performance Hand-Held Gas Chromatograph." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1288.

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Abstract The Microtechnology Center of Lawrence Livermore National Laboratory has developed a high performance hand-held, real time detection gas chromatograph (HHGC) by Micro-Electro-Mechanical-System (MEMS) technology. The total weight of this hand-held gas chromatograph is about 5 lbs., with a physical size of 8″ × 5″ × 3″ including carrier gas and battery. It consumes about 12 watts of electrical power with a response time on the order of one to two minutes. This HHGC has an average effective theoretical plate of about 40k. Presently, its thermal sensitive detector at PPM limits its sensitivity. Like a conventional G.C., this HHGC consists mainly of three major components: 1) the sample injector, 2) the column, and 3) the detector with related electronics. The present HHGC injector is a modified version of the conventional injector. Its separation column is fabricated completely on silicon wafers by means of MEMS technology. This separation column has a circular cross section with a diameter of 100 μm. The detector developed for this hand-held G.C. is a thermal conductivity detector fabricated on a silicon nitride window by MEMS technology. A normal Wheatstone bridge is used. The signal is fed into a PC and displayed through LabView software.

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Miziolek, Andrzej W., Jeffrey B. Morris, and Brad E. Forch. "Application of UV Laser-Produced Microplasmas as a Novel Detector for Gas Chromatography." In Laser Applications to Chemical Analysis. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/laca.1990.tua2.

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Earlier work in our laboratory has demonstrated the unusual ability of UV lasers to produce microplasmas in gaseous flows using very low pulse energies (< 1 mJ). One of the reasons that this pulse energy requirement is so low is that there are strong resonance effects in the production of the seed electrons necessary for microplasma growth. One application of this phenomenon is to use microplasma formation in the effluent gases of a gas chromatograph (GC) as the basis for a new GC detector.

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Yeh, Cheng-Han, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani, Yuji Suzuki, and Kenichi Morimoto. "Deep Electrode and Parylene E-Based Capacitive VOC Detector for Micro Gas Chromatograph Application." In 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII). IEEE, 2019. http://dx.doi.org/10.1109/transducers.2019.8808298.

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Bae, Byunghoon, Jihyung Kim, Junghoon Yeom, Qingmei Chen, Curtis Ray, and Mark Shannon. "Development of a portable gas analyzer using a micro-Gas Chromatograph/Flame Ionization Detector (micro-GC/FID) for NASA's environmental missions." In 42nd International Conference on Environmental Systems. American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-3435.

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Drummond, John W., Gervase I. Mackay, and Harold I. Schiff. "Measurement of peroxyacetyl nitrate, NO 2 , and NOx by using a gas chromatograph with a luminol-based detector." In Optics, Electro-Optics, and Laser Applications in Science and Engineering, edited by Harold I. Schiff. SPIE, 1991. http://dx.doi.org/10.1117/12.46168.

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Green, Alex E. S., and James P. Mullin. "Feedstock Blending Studies With Laboratory Indirectly Heated Gasifiers." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-574.

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To support the further development of indirectly heated gasifiers, intended to provide fuels for advanced gas turbines, several laboratory indirectly heated gasifiers were constructed. During many comparative tests advantages and problems with each system were observed. The most useful systems make use of laboratory tube furnaces in conjunction with temperature, time and pressure or volume yield measuring systems and a gas chromatograph with a thermal conductivity detector. In this paper high temperature pyrolysis results obtained with the latest system are presented. Contrasting feedstocks suitable for commercial systems separately or in blends are used. Yield vs. time measurements are used to determine relevant rate constants and outputs. Since the rate constants are mainly reflective of heat transfer effects, cylindrical dowel sticks of varying radii were volatilized. The data set leads to an analytic heat transfer model that considers the hemicellulose, cellulose, and lignin components of the dowels. Also developed from the dowel experiments is an approximate procedure for estimating the proportionate releases of CO, CO2, CH4 and H2 for any type of biomass whose component proportions are known.

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Ochi, Takeshi, Norio Arai, Tomohiko Furuhata, and Naoki Kishi. "Effect of H2 Addition on Soot Formation in Fuel-Rich CH4/Air Turbulent Diffusion Flames." In 2002 International Joint Power Generation Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ijpgc2002-26067.

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In this study, the difference of temperature and the component of chemical species on soot formation in CH4/air fuel-rich diffusion flames were investigated. Furthermore, for decreasing soot formation in fuel-rich diffusion flames, we added H2 in CH4, investigated the property of combustion, and compared with methane/air fuel-rich flames. We have paid much attention to the influence of the equivalence ratio of methane (+H2)/air, the swirl strength of combustion air and the concentration of C2H2 on the soot formation. The experimental combustor for CH4(+H2)/air combustion was designed, and the soot resulting from the exhaust gas collected with a silica filter and its weight was measured. The microstructure of the soot particles were analyzed with a Scanning Electron Microscopy (SEM). The temperature profiles in the combustor were measured by thermocouples, and the concentrations of the species O2, CO2, H2, CH4 and C2H2 were determined by a TCD (thermal conductivity detector) gas chromatograph (GC) and FID (flame ionization detector) GC. The soot yields diminished with increasing swirl strength and the C2H2 concentration. When H2 was added to the fuel, combustion was promoted and C2H2 concentration in the exhaust gas was diminished. But using strong swirl, fuel and air were mixed quickly, the effect of H2 addition was decreased.

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Bewick, Patrick, Eva Collakova, and Bo Zhang. "Identification of Soybean Germplasm with Higher Concentrations of Long Chain Fatty Acids." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/yetx4658.

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Fatty Acids are essential components of the diet and are critical for proper cell function. A balanced ratio of ω-3 to ω-6 fatty acids can be tied to positive human cardiovascular and autoimmune health. Aquaculture requires a much higher ratio. Soybean contains a substantial amount of fatty acids, but many varieties contain significantly higher concentrations of ω-6 fatty acids. The objective of this project was to identify soybean accessions with unique fatty acid profiles for genetic analysis to inform breeding decisions. Samples of 50 accessions originating from 16 countries were taken from seeds harvested in Blacksburg, VA in 2020. A gas chromatograph-flame ionization detector was used to quantify fatty acid levels and composition. Mass spectrometry was used to confirm the identity of peaks of interest. Fatty acid profiles for each sample were compared to the mean of all samples, and accessions with significantly different fatty acid concentrations were identified. These preliminary results will be used to inform future projects.

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Li-ling, Yang, Yang Hong-guang, Liu Zhen-xing, and Xia Ti-rui. "Analysis and Application of Trace H2 and CH4 in Cycling Process Gas of Fusion Reactors by Gas Chromatography." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67522.

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It’s necessary to establish a high-precision analytical method of Gas Chromatography (GC) for achieving the rapid detection of trace hydrogen and methane in cycling process gas of fusion reactors. The analysis of H2, CH4 with concentrations from 0.5ppm to 5000ppm were detected through the application of Discharge Ionization Detector (DID) in high purity helium and the column of molecular sieve, whose parameters was 15m×0.53mm×50μm. The studies have shown that the retention time of H2, CH4 were 36s and 71s, respectively, their relatively standard deviation (RSD) of area responses were severally below 1.0% and 0.5%, which illustrated good repeatability. Separately, the detection limit (DL) were no more than 10ppb and 2ppb of H2 and CH4 with high column efficiency, while the column temperature was 40°C and the flow rate was 15mL/min. Meanwhile their values of R2 were all larger than 0.999, which included a better linearity relationship between area response and concentration. This method has already applied to the on-line measurement of molecular sieve adsorption, the analysis of electrochemical hydrogen pump and methane decomposition, etc.

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Reports on the topic "Gas chromatograph detector"

1

Longworth, Terri L., John M. Baranoski, and Kwok Y. Ong. Domestic Preparedness Program: Evaluation of the Agilent Gas Chromatograph - Flame Photometric Detector/Mass Selective Detector (GC-FPD/MSD) System Against Chemical Warfare Agents Summary Report. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada416884.

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Lee, Richard N., Brian P. Dockendorff, and Bob W. Wright. Analytical Method for the Detection of Ozone Depleting Chemicals (ODC) in Commercial Products Using a Gas Chromatograph with an Electron Capture Detector (GC-ECD). Office of Scientific and Technical Information (OSTI), 2008. http://dx.doi.org/10.2172/944011.

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Olsen, Daniel, and Brenna King. PR-179-18203-R01 Experimental Evaluation of Stack Testing Methods for Accurate VOC Measurement. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011654.

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Volatile organic compounds (VOCs) are defined as non-methane, non-ethane hydrocarbons and have negative environmental effects, especially in the formation of ozone that creates smog. The combination of a gas chromatograph and a flame ionization detector can be implemented to quantify VOCs in engine exhaust following EPA Method 18/25A. The Fourier Transform Infrared Spectrometer can also be used to quantify VOCs in engine exhaust gas, following EPA Method 320. In this work testing and data analysis are performed with both measurement methods on multiple analyzers utilizing different engine types, conditions, and fuel quality. The accuracy of the measurement methods and data analysis approaches are compared and evaluated.

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Lockrem, L. L. Evaluation of a gas chromatograph with a novel surface acoustic wave detector (SAW GC) for screening of volatile organic compounds in Hanford waste tank samples. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/362485.

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Bora. PR-004-14604-R01 Miniaturized Gas Chromatography and Gas Quality Sensor. Pipeline Research Council International, Inc. (PRCI), 2015. http://dx.doi.org/10.55274/r0010869.

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The natural gas industry currently relies on gas chromatography to evaluate the composition of natural gas including alkanes, carbon dioxide, nitrogen, and oxygen. The higher and lower heating values, Wobbe Index, Hydrocarbon Dewpoint, Methane Number, and viscosity are all calculated from the gas composition. The need to understand the composition of fuel gas and to monitor its components is crucial to the natural gas industry. Monitoring the composition of the fuel gas provides the industry with the capability of protecting valuable underground assets, delivering gas that meets end-usage requirements, and tracking of constituents for both billing purposes and to ensure compliance with tariff agreements. As with any technology, there are limitations to gas chromatography. Limitations can include high cost, time delay, inability to sample at high pressure, and selectiveness of gas chromatography detectors. This project consisted of a technology assessment of currently available and emerging technologies including micro gas chromatographs, optical spectrometers, and mass spectrometers for their ability to determine gas composition compared to current GC technology. Technologies were investigated and assessed by their analytical characteristics (what components they could analyze and detection limits), their sampling characteristics (sampling pressure limits, scan time, and emissions), and their operational characteristics (availability, cost, consumables, maintenance, and packaging). Recommendations for further testing were made on the technologies whose characteristics showed the most promise for analysis of natural gas at custody transfer points.

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Sklarew, D. S., J. C. Evans, and K. B. Olsen. Multielement detector for gas chromatography. Office of Scientific and Technical Information (OSTI), 1988. http://dx.doi.org/10.2172/6806223.

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Brina, Rossella, and Stanley Pons. The Use of Narrow Gap Line Microelectrodes as Sensitive and Species Selective Gas Chromatographic Detectors. Defense Technical Information Center, 1988. http://dx.doi.org/10.21236/ada200424.

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Wood, William F., David L. Largent, and Darvin A. DeShazer. The cooked shellfish-odour of the mushroom Russula xerampelina. Verlag der Österreichischen Akademie der Wissenschaften, 2024. http://dx.doi.org/10.1553/biosystecol.3.e115244.

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The “shrimp mushroom”, Russula xerampelina, has a strong cooked shellfish odour. Headspace volatiles from fresh sporocarps of this mushroom were analysed using solid phase microextraction (SPME) and gas chromatography–mass spectrometry (GC–MS). Trimethylamine and trimethylamine N-oxide were the only volatile compounds detected emanating from the fruiting body. Trime- thylamine is noted for its fishy, cooked crab or cooked shrimp-like odour.

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Hewitt, Alan D., Thomas F. Jenkins, and Thomas A. Ranney. Field Gas Chromatography/Thermionic Detector System for On-Site Determination of Explosives in Soils. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada394244.

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Conrady, Morgan, Markus Bauer, Kyoo Jo, Donald Cropek, and Ryan Busby. Solid-phase microextraction (SPME) for determination of geosmin and 2-methylisoborneol in volatile emissions from soil disturbance. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42289.

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A method is described here for the concentration and determination of geosmin and 2-methylisoborneol (2-MIB) from the gaseous phase, with translation to field collection and quantification from soil disturbances in situ. The method is based on the use of solid-phase microextraction (SPME) fibers for adsorption of volatile chemicals from the vapor phase, followed by desorption into a gas chromatograph-mass spectrometer (GC-MS) for analysis. The use of a SPME fiber allows simple introduction to the GC-MS without further sample preparation. Several fiber sorbent types were studied and the 50/30 μm DVB/CAR/PDMS was the best performer to maximize the detected peak areas of both analytes combined. Factors such as extraction temperature and time along with desorption temperature and time were explored with respect to analyte recovery. An extraction temperature of 30 ◦C for 10 min, with a desorption temperature of 230 ◦C for 4 min was best for the simultaneous analysis of both geosmin and 2-MIB without complete loss of either one. The developed method was used successfully to measure geosmin and 2-MIB emission from just above disturbed and undisturbed soils, indicating that this method detects both compounds readily from atmospheric samples. Both geosmin and 2-MIB were present as background concentrations in the open air, while disturbed soils emitted much higher concentrations of both compounds. Surprisingly, 2-MIB was always detected at higher concentrations than geosmin, indicating that a focus on its detection may be more useful for soil emission monitoring and more sensitive to low levels of soil disturbance.

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