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Dissertations / Theses on the topic 'Gas Chromatography-Flame Ionization Detector'

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1

Powell, Jodi. "Evaluation of Initial Flavor Fade in Fresh Roasted Peanuts using Gas Chromatography-Flame Ionization Detection, Gas Chromatography-Olfactometry, Sensory Analysis, and Chemosensory Techniques." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29127.

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Preventing flavor fade requires an understanding of the relationship between carbonyl amine and lipid oxidation reactions. The polyunsaturated fatty acid content of lipids in peanuts makes them more susceptible to lipid oxidation. The major by-products of the oxidation reaction are nonanal, hexanal, octanal, and decanal. These chemicals are associated with cardboardy, painty, and oxidized flavors associated with flavor fade. The carbonyl-amine reaction yields a variety of pyrazines with positive flavor attributes. Initial flavor notes were explored through sensory work, Gas Chromatograp
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2

Shinde, Suhas, Shivakumar Devaiah, and Aruna Kilaru. "Profiling Abscisic Acid-Induced Changes in Fatty Acid Composition in Mosses." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/4745.

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In plants, change in lipid composition is a common response to various abiotic stresses. Lipid constituents of bryophytes are of particular interest as they differ from that of flowering plants. Unlike higher plants, mosses have high content of very long-chain polyunsaturated fatty acids. Such lipids are considered to be important for survival of nonvascular plants. Here, using abscisic acid (ABA )-induced changes in lipid composition in Physcomitrella patens as an example, a protocol for total lipid extraction and quantification by gas chromatography (GC) coupled with flame ionization detecto
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3

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, prima
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4

Ghodsian, Bahram. "Development of micromachined field ionization tips for use as an integrated gas detector in a micromachined gas chromatography system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ37704.pdf.

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5

Topal, Tansel. "Investigation Of Extraction Methodologies For Quantitative Determination Of Polycyclic Aromatic Hydrocarbons In Sediments." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612913/index.pdf.

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The extraction procedures for the determination of polycyclic aromatic hydrocarbons (PAH) concentrations in sediment samples had been developed by using GC-FID and GC-MS. The optimized methods were soxhlet extraction, ultrasonic bath extraction and solid phase micro extraction (SPME). In order to search out the main factors affecting extraction efficiencies of the methods, factorial design was used. The best extraction method was chosen and optimum values for main factors were selected for the development of the extraction method for PAH determination in sediment samples. The accuracy of the m
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6

Njie, Njaw. "Use Of Multi-walled Carbon Nanotubes In Matrix Solid Phase Dispersion Extraction Combined With Gas Chromatography." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609590/index.pdf.

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The use of Multi-Walled Carbon Nanotubes (MWCNT) as solid sorbent in Matrix Solid-Phase Dispersion (MSPD) extraction and preconcentration method was presented to determine some commonly used organophosphorus insecticides/OPIs in honey samples using a Gas Chromatography Flame Ionization Detector (GC-FID). OPIs are poisonous compounds used to kill insects and rodents by affecting their nervous system. The limit of detections obtained after MSPD extraction were 7.0 ng/g for Malathion, Malaoxon and Fenitrothion and 33.3 ng/g for Isomalathion. The recovery of the insecticides from spiked honey, ran
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7

Bergner, Sandra, and Sandra Nilsson. "Screening of volatile compounds in washing water and cloths from the sponge cloth process." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57114.

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<p>Freudenberg Household Products AB in Norrköping are manufacturer of sponge cloths with the well-known brand names of Wettex<sup>®</sup> and Vileda<sup>®</sup>. The production is based on the viscose fiber process and involves a high chemical demand. Recent customer complaints involve a diffuse smell from the cloths that is like a “garage odor” and occurs after a few uses. The company’s theory is that the smell derives from a chemical used in the process called Exxal 9.</p><p>The aim was to screen the washing water from two sections and the cloth before and after wash for the presence of Exx
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8

Divišová, Radka. "Analýza vonných látek v kosmetických prostředcích metodou plynové chromatografie." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216530.

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This thesis is focused on aroma compounds which are presented in a wide variety of products including perfume, cologne, cosmetics, toiletries, laundry products and detergens. The widespread use and exposure to aroma compounds of aforementioned products could cause a range of the adverse reactions such as contact dermatitis, asthma, eczema and breathing problems. There are a lot of aroma compounds triggering negative allergic reactions but EU regulations limit 26 the most important fragrance allergens. The presence of these substances has to be declared on the product label if a limit of 0,01 %
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9

Daphney, Cedrick M. "The Fate and Transport of Chemical Warfare Agent Simulants in Complex Matrices." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/chemistry_theses/13.

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Experiments to determine the fate and transport of the chemical warfare agent (CWA) simulants diisopropyl fluorophosphate (DIFP), O,S-diethyl methylphosphonothioate (OSDEMP), and 2-Chloroethyl ethyl sulfide (CEES) exposed to complex matrix systems are reported here. The aforementioned simulants were used in place of O-isopropyl methylphosphonofluoridate (GB), O-Ethyl S-(2-diisopropylaminoethyl) methylphosphonothiolate (VX), and Bis (2-chloroethyl) sulfide (HD), respectively. At ambient temperature, simulant pH (2.63 to 12.01) and reaction time (1 minute to 24 hours) were found to have signi
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10

Kabir, Abuzar. "Polytetrahydrofuran- and dendrimer- based novel sol-gel coatings for capillary microextraction (cme) providing parts per trillion (ppt) and parts per quadrillion (ppq) level detection limits in conjunction with gas chromatography and flame ionization detection (fid)." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001192.

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11

Magdechová, Andrea. "Stanovení organických sloučenin v dehtu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-216728.

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The diploma thesis deals with determination of organic compounds in the tar. It is focussed on polycyclic aromatic hydrocarbons, BTEX and n-alkanes. The tar samples were collected by Faculty of Mechanical Engineering BUT Brno during two days and under diferent conditions of biomass gasification. The samples were filtrated and refined using column chromatography on silicagel sorbent. Gas chromatography with mass detection was chosen to determine polycyclic aromatic hydrocarbons and gas chromatography with flame ionisation detection was chosen to determine BTEX and n-alkanes.
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12

Åkervall, Anton. "Development of a GC Method for the Quantification of Short Chain Carboxylic Acids in Aqueous Solution." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166367.

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Petroleum powered vehicles emit volatile organic compounds (VOCs) through combustion that contributes to the pollution of the environment. A technique in the 1970s was developed to decrease these emissions, especially for nitrogen oxides (NOx) and sulphuric oxides (SOx) which is called exhaust gas recirculation (EGR). The technique works by recirculating a portion of the combusted gas back into the engine, this limits the NOx and SOx emissions because of lower temperatures and less available oxygen. The problems that follow these effects is the formation and condensation of acids that corrode
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13

Švarcová, Lucie. "Chirální analýza syntetických vonných látek ve vodním ekosystému." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217084.

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Diploma thesis summarizes available information about chiral analysis of synthetic musk compounds in the aquatic environment. In the theoretical part of the thesis chirality and importance of chiral analysis by means of examples of different environmental pollutants is documented. Further consideration is aimed on musk compounds, their classification, characteristics and their fate in the environment, especially in the aquatic environment. After that methods for chiral analysis of synthetic musk compounds are reviewed. The aim of the experimental part of this diploma thesis was to carry out th
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14

Nasreddine, Rouba. "Développement d'une méthode analytique et d'un microanalyseur miniaturisé pour la détection des BTEX dans l'air." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF010.

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Les BTEX est une famille de polluants très répandue en air intérieur. Ils présentent des effets nocifs sur la santé humaine à des faibles concentrations ce qui a emmené le législateur à fixer des seuils afin de limiter l'exposition des gens. L'objectif de ce travail de recherche est de développer et de mettre en place une méthode analytique sensible, précise et rapide basée sur un dispositif de mesure. Le dispositif ainsi mis en place est un chromatographe en phase gazeuse miniaturisé équipé d'un mini détecteur à photo ionisation dédié à la détection des BTEX en temps quasi-réel. Le système an
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15

Becker, Christian [Verfasser], and Torsten C. [Akademischer Betreuer] Schmidt. "Development of a thermospray nebulizer interface for liquid chromatography with flame ionization detection and detector response studies of volatile and non-volatile compounds / Christian Becker ; Betreuer: Torsten C. Schmidt." Duisburg, 2019. http://d-nb.info/1196008280/34.

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16

Avillez, Maria Vaz Pinto d’. "Part I : Comparing derivatization methods for amino acids – one and two-step procedures using gas chromatography – flame ion detector (GC-FID) Part II: Story of an icon from its execution until its conservation." Master's thesis, FCT - UNL, 2007. http://hdl.handle.net/10362/3613.

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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Conservação e Restauro<br>Two derivatization methods were tested in twenty-one standard amino acids (AAs) for further identification and quantification by the analytical technique of Gas Chromatography with Flame Ion Detector (GC-FID). For the one-step derivatization reaction N-methyl-N (tert.- butyldimethylsilyl)trifluoroacetamide (MTBSTFA) was used and for the two-step reaction we used hydrochloridic acid (HCl) and trifluoroacetic anhydride (TFAA). We obtained bet
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17

Talbert, Susan Lynn. "Quantitative analysis of acetone in blood via headspace gas chromatography/flame ionization detection." 2009. http://digital.library.okstate.edu/etd/Talbert_okstate_0664M_10460.pdf.

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18

HE, TANG CHUEN, and 唐川禾. "Determination of Organotin in Water by Purge and Trap Gas Chromatography-Flame Ionization Detection." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/00031685326258811126.

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碩士<br>國立中山大學<br>海洋資源學系<br>88<br>Abstract Organotin compounds have been extensively used in agriculture and industry. The utilization of tributyltin(TBT) in marine antifoul-ing paints pollutes water body significantly. Due to the high toxicity of organotins, there are increased concern for marine environments. A purge and trap system coupled to a gas chromatography(GC) equipped with a flame ionization detector(FID) was used to analyze organotin compounds in water samples. Hydride derivation of orga-notin compounds is conducted by reacting with 5 % sodium boro-hydride i
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19

Ciou, Jhih-Yong, and 邱志勇. "Simultaneous determination of acetaminophen and caffeine in pharmaceutical syrup preparations and drinks by gas chromatography with flame ionization detector." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/55942200977562766899.

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碩士<br>高雄醫學大學<br>藥學研究所<br>96<br>A simple and rapid method for simultaneous analysis of acetaminophen and caffeine in commercial cold syrups and drinks is described. The method was based on direct gas chromatography with flame ionization detector. The samples were simply pretreated by liquid-liquid extraction and then analyzed by GC with a fused-silica VF-5ms capillary column (30 m × 0.32 mm, 0.25 μm). The temperatures of injector and detector were set at 250℃ and 280℃, respectively. The column oven was maintained at 180℃ for 1 min, ramped at a rate of 20℃/min to 240℃ and held for 1 min. Several
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20

Wei, Hong Chung, and 洪崇惟. "Analysis of Organic Solvent Mixtures in Urine Using Hollow Fiber Headspace Liquid-phase Microextraction and Gas Chromatography with Flame Ionization Detector." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/marf2f.

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碩士<br>長榮大學<br>職業安全與衛生學系碩士班<br>96<br>Multiple organic solvents, such as benzene, toluene, xylene, n-hexane, n-heptane, n-octane and methylcyclohexane, were used in an adhesive of factory. Workers exposure to these different kinds of solvents in the workplace. These substances will be translated into different kinds of metabolites. Therefore, biological monitoring of workers exposed to organic solvents is important step toward the evaluation of the toxicological effect of chemical solvents. In this study, a hollow fiber headspace liquid phase microextraction(HF-HS-LPME) and gas chromatograph
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21

Jay, Chang-Chy, and 張志杰. "A Study on the Simultaneous Determination of Twelve Food Preservatives by Gas Chromatograph - Flame Ionization Detector." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/74690826112824161663.

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碩士<br>國立屏東科技大學<br>食品科學系所<br>95<br>At present, most methods for determining food preservatives are based on the testing methods of Chinese National Standards (CNS 10949-N6190). The methods require collecting the distillate by dissolving with pure water or solvent or by steam distillation, to extract the distillate repeatedly with ether at different PH values through multiple complicated processes and then the concentrate must be analyzed by Gas Chromatograph-Flame Ionization Detector (GC-FID). The above-mentioned methods could be applied when the sample number is small. However, the quantity
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22

Gil, Inês Faria. "Analysis of methanol’s purity by GC-FID and rainwater analysis by HACH DR3900." Master's thesis, 2019. http://hdl.handle.net/10773/30157.

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Bresfor S.A. is mainly a formaldehyde and UF resins production plant. Its feedstocks are methanol, water, urea and melamine. Methanol is bought in large quantities and it is also sold to other companies, including pharmaceutical companies. That type of companies requires methanol to have a high purity degree and its contaminants to be determined with accuracy. So, Bresfor is to start using GC-FID to determine the purity of methanol and the concentration of the most common contaminants (ethanol, propan-1-ol and acetone). Bresfor’s environmental license given by APA (LA Bresfor nº 539/20
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23

Chiloane, Kgaugelo Euphinia. "Volatile organic compounds(VOC's) analysis from Cape Town haze ll study." Thesis, 2006. http://hdl.handle.net/10539/1611.

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Student Number: 9503012G Master of Science. School of Geography, Archaeology and Environmental Studies<br>A brown haze which builds-up over Cape Town under calm and cold weather conditions causes public concern. The brown haze is thought to be due to the gaseous and particulate emissions from the city, industries, traffic and townships in the Cape Town region. Volatile organic carbon (VOCs) compounds are an important component of the haze layer particularly because of their reactivity. VOCs play an important role in the carbon budget and radiation balance, regional oxidant balance, and in
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