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Dissertations / Theses on the topic 'Extraction and chromatography'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Carter, Helen. "Uranium separations using extraction chromatography." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/11261.

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In the analysis of environmental samples for uranium and thorium pollutants and at natural levels for the dating of geological samples there was felt a need to develop better uranium and thorium separation procedures to replace the established anion exchange method used at AEA Technology plc. This was the first aim of the PhD research. Separation of uranium from thorium prior to measurement of the isotopes by alpha spectrometry was necessary due to the similar alpha energies of234U and 230Th. TRU and UTEVA extraction chromatography resins (EIChroM Industries) were investigated as potential rep

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2

Kithinji, Jacob P. "Extraction and chromatography of supercritical fluids." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329092.

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3

FRAZER, SCOTT RAYMOND. "INFORMATION EXTRACTION IN CHROMATOGRAPHY USING CORRELATION TECHNIQUES." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187978.

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While research into improving data quality from analytical instrumentation has gone on for decades, only recently has research been done to improve information extraction methods. One of these methods, correlation analysis, is based upon the shifting of one function relative to another and determining a correlation value for each displacement. The cross correlation algorithm allows one to compare two files and find the similarities that exist, the convolution operation combines two functions two dimensionally (e.g. any input into an analytical instrument convolves with that instrument response

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4

FIGOLS, MARYCEL B. "Separacao de tracos de neptunio de solucoes de uranio por cromatografia de extracao." reponame:Repositório Institucional do IPEN, 1990. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10252.

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Made available in DSpace on 2014-10-09T12:36:33Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:25Z (GMT). No. of bitstreams: 1 04128.pdf: 1590962 bytes, checksum: a2a8a7eb89c0f7f7f379ee9b9fd352fd (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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5

Cui, Yi. "Studies of enhanced-fluidity solvents for chromatography and extraction /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487779914825109.

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6

Yuan, Huimin. "Applications of enhanced-fluidity liquids in chromatography and extraction /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487947908401666.

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7

FERNANDES, LIZETE. "Estudo para a preparacao de Talio-201 pela irradiacao de mercurio com protons .Aplicacao da tecnica de cromatografia de extracao na separacao de talio do mercurio." reponame:Repositório Institucional do IPEN, 1990. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10239.

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8

Slack, Gregory C. "Coupled solid phase extraction-supercritical fluid extraction on-line gas chromatography of explosives from water." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-05042006-164508/.

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9

Shilstone, Gavin Forbes. "Physical properties in supercritical fluids applied to extraction and chromatography." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277481.

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10

Möller, Kristina. "Molecularly Imprinted Solid-Phase Extraction and Liquid Chromatography for Biological Samples." Doctoral thesis, Stockholms universitet, Institutionen för analytisk kemi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1042.

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This thesis focuses on the use of molecularly imprinted polymers as selective sorbents for solid-phase extraction (MISPE). The MISPE methods developed were mainly intended for use with biological samples, such as human urine and blood plasma. These body fluids are complex samples, which often need an effective clean-up step before analysis to reduce the levels of possible interfering substances from the matrix, especially if the analytes are present in trace amounts. Solid-phase extraction (SPE) is a well-established and routinely used method for clean-up and preconcentration of samples from d

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11

MacKay, Graham A. "Supercritical fluid extraction and chromatography and mass spectrometry studies of biopolymers." Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/28229.

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Supercritical fluid extraction (SFE) and supercritical fluid chromatography (SFC) are used to study the presence of additives in polymers that are used in living systems. Representative samples are used to illustrate and develop the extraction capability of the system with extracts being analysed both by on-line and off-line SFC, gas chromatography-mass spectrometry (GC-MS), and gravimetrically. Different types of additives are employed illustrating their chromatographic behaviour and the uses of both flame ionisation (FID) and UV /Visible detection. The qualitative aspects of the analysis of

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12

Yip, Shiu Hang. "Supercritical Fluid Extraction and Chromatography of Various Lipids from Soybean Lecithin." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35349.

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Phospholipids are commonly found in biological membranes. They have a polar head group and two ester linked fatty acids tails. Different methods such as thin layer chromatography and high performance liquid chromatography coupled with ultraviolet, refractive index, flame ionization detector, and mass spectrometry (MS) detection have long been used in the study of phospholipids. These methods were time-consuming and lacked quantitative accuracy. In this work, phosphatidylcholine, phosphatidyl-ethanolamine, phosphatidylinositol and phosphatidylserine have been studied by supercritical fluid chro

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13

Mulcahey, Leah J. "Applications of modifiers in supercritical fluid extraction and chromatograph." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134424/.

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14

Mekaoui, Nazim. "Contribution à l'étude de la chromatographie à contre-courant : partage de composés ionisables, nouvelles colonnes et purification séquentielles." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10249/document.

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La chromatographie à contre courant (CCC) est une technique de purification chimique préparative quitravaille avec un système biphasique liquide. Une phase est la phase mobile, l'autre phase est la phasestationnaire. Il n'y a aucun support solide: un champ de force centrifuge est utilisé pour maintenir en place laphase stationnaire. Ce travail est une contribution à l'étude de la purification préparative par CCC. Après uneimportante étude bibliographique des procédés de purification en continu tant en CCC qu'autres, il est montréque la méthode dite "multi-dual-mode", ou MDM, est une solution p

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15

Zomer, Simeone. "Application of chemometrics for feature extraction and pattern recognition in hyphenated chromatography." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432960.

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16

Tajuddin, Ruziyati. "Superheated water extraction (SWE) coupled on-line with superheated water chromatography (SWC)." Thesis, Loughborough University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403568.

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17

El-Henshir, Abdulla K. "The fractionation of crude petroleum using chromatography, extrography and supercritical fluid extraction." Thesis, University of South Wales, 1997. https://pure.southwales.ac.uk/en/studentthesis/the-fractionation-of-crude-petroleum-using-chromatography-extrography-and-supercritical-fluid-extraction(adfb6051-953a-418b-9042-2dc35247f71a).html.

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The accurate and reliable analysis of crude oil, weathered oil and oil-spill related environmental samples is extremely important in view of the distribution of oil pollution in the environmental. In this work the fractionation selectivity of column chromatography, extrography and supercritical fluid extraction was compared. Column chromatography with a silica gel as stationary phase provided a means of fractionating a standard mixture of saturated and aromatic hydrocarbons and crude oils such that the aromatic profile could be determined by GC-MS. The recoveries of saturated, aromatic and pol

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18

Fischer, Monika. "Application of supercritical fluid chromatography and extraction in pharmaceutical and environmental analysis." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338408.

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19

Martin, Danica Paige. "Optimization of a Method for the Extraction of Drugs of Abuse from Wastewater." Bowling Green State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1617014087323429.

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20

Jenkins, R. E. "Studies of veterinary drugs by supercritical fluid extraction, supercritical fluid chromatography and supercritical fluid chromatography-mass spectrometry in equine samples." Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637419.

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Initially, the feasibility of using supercritical fluid chromatography as a means of analysing veterinary drugs was investigated. The classes of drugs that were studied included xanthins, corticosteroids and diuretics. Packed column supercritical fluid chromatography interfaced to mass spectrometry using the moving belt and thermospray interfaces was also investigated as a method of analysis. Standard mixture of the drugs were successfully separated and detected using supercritical fluid chromatography-mass spectrometry. Supercritical fluid extraction was investigated for its potential as an a

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21

Hewitson, Peter. "Intermittent counter-current extraction : a new continuous dynamic liquid-liquid extraction methodology." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/13900.

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For the pharmaceutical industry, the manufacture of high value pharmaceuticals from natural products, chemical synthetic routes or fermentation processes all require intensive downstream processing steps to produce a pure final product. A small footprint liquid-liquid processing method would help to reduce the capital cost and process development time of this downstream processing. In this thesis, it is hypothesised that continuous liquid-liquid extraction can be achieved using a standard hydrodynamic counter-current chromatography (CCC) instrument by switching the flow of the liquid phases be

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22

Momin, Vasim Rasul. "The Analysis of Antimicrobial Testing Vincetoxicum stocksii and Isolation of a Highly Active Compound Against Candida albicans by Using Various Different Techniques." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/chemistry_theses/9.

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The purpose is to isolate a natural compound, which shows a high activity against Candida albicans, from plant, Vincetoxicum stocksii. Bio-Assay, Thin layer Chromatography, Column Chromatography, TLC bio Assay, and other extraction techniques are used in order to isolate the active compound. First, bio assay technique is carried out on the crude gum. Next, several flash chromatography columns are carried out in order to isolate the target compound, which has a Rf value of ~0.53 in 10:1 DCM/methanol solvent mixture. The TLC bioassay technique is also carried out in order to confirm the hyp

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23

Möller, Kristina. "Molecularly imprinted solid-phase extraction and liquid chromatography/mass spectrometry for biological samples /." Stockholm : Department of Analytical Chemistry, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1042.

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24

Burman, Lina. "Chromatography and extraction techniques for new evaluation methods of polyolefins long-term performance." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219.

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25

Kirschner, Cynthia Hume. "Supercritical fluid extraction/chromatography and Fourier transform infrared spectrometry : methods optimization and applications /." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-05042006-164521/.

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26

Smith, Susan H. "Extraction of Additives from Polystyrene and Subsequent Analysis." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36774.

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The extraction of fifteen (15) polymer additives with supercritical carbon dioxide which are used as antioxidants, uv stabilizers, process lubes, flame retardants and antistats from eight formulations of polystyrene is demonstrated and compared to traditional dissolution/precipitation extractions. The purpose of the study was twofold: 1) the development of a high performance liquid chromatography (HPLC) method(s) for the additives and 2) the determination of the viability of supercritical fluid extraction (SFE) for the additives from polystyrene. Separation of some of the additives was ac

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27

Jennings, David Wayne. "High pressure phase equilibria and supercritical fluid extraction involving carbon dioxide systems." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/11239.

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28

Beaman, J. V. "Development of a new interface for supercritical fluid chromatography/mass spectrometry and studies of photochromic compounds by supercritical fluid extraction, supercritical fluid chromatography and supercritical fluid chromatography/mass spectrometry." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636063.

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The commercial applications and types of photochromic are many and varied. In this work spiroxazines, spiropyrans and fulgides, of the type used in optical lenses, were examined using a variety of analytic techniques. Initially the feasibility of using supercritical fluid extraction (SFE) for the extraction of photochromics, and some UV stabilisers, from lens matrices was investigated for the first time. Packed column supercritical fluid chromatography combined with mass spectrometry (pSFC/MS), using both a moving belt and a thermospray interface, was assessed as a method for the separation an

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29

Stopforth, A. "Stir bar sorptive extraction and gas chromatography : mass spectrometry for the analysis of biological matrices." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/716.

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30

Zhu, Ming. "An Immobolized Surfactant Extraction Technique Compatible with High Performance Liquid Chromatography-Ultraviolet Visible Detection." TopSCHOLAR®, 1999. http://digitalcommons.wku.edu/theses/765.

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Surfactant mediated extractions are analogous to liquid-liquid extractions (LLE) except surfactants are used as extractants instead of organic solvents. The benefit for using surfactants for extractions includes lower toxicity, lower associated costs and direct compatibility with high performance liquid chromatography techniques. In this study, a novel immobilized surfactant extraction method was developed. In this method, the cationic alklytrimethylamrnonium surfactants are immobilized onto a strong cationic exchange resin through ion exchange. This surfactant-resin material is placed in a co

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31

Huang, Hui-ping. "The analysis of polar natural products by supercritical fluid techniques of chromatography and extraction." Thesis, Keele University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316711.

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32

Billakanti, Jaganmohan. "Extraction of High-Value Minor Proteins from Milk." Thesis, University of Canterbury. Chemical and Process Engineering, 2009. http://hdl.handle.net/10092/3843.

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Various methods for extraction and analysis of high value minor proteins (lactoferrin, lactoperoxidase and immunoglobulins) directly from raw milk were explored. Extraction, purification and analysis of high-value minor proteins directly from milk without pre-treatment are major challenges for dairy industry, largely due to the complexity of milk and the presence of colloidal solids (casein micelles and milk fat globules). To overcome some of these challenges, this work focused on three main objectives: 1) characterization of cryogel monolith chromatography for purification of lactoferrin (LF)

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33

Mills, Malcolm John. "Effective use of microbore LC with peak compression for the analysis of drugs in biological fluids." Thesis, University of Sunderland, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297131.

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34

Knight, Andrew William. "Radiochemical analysis of protactinium speciation: applications in nuclear forensics, nuclear energy, and environmental radiochemistry." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/2233.

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Protactinium (Pa) is an actinide with chemical properties that are unique among the actinide elements. While the properties of other actinides are to a large extent understood, much of the chemistry of Pa remains a mystery. This thesis aims to illuminate new understanding of Pa chemistry through behavioral analysis using analytical techniques including liquid-liquid extraction (LL); extraction chromatography (ExC); and spectroscopic studies. Applications of radioanalytical chemistry and Pa: Through the research presented in this dissertation, we have developed a new way to separate uranium (U)

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35

Song, Shin Miin, and shinmiin@singnet com sg. "Comprehensive two-dimensional gas chromatography (GCxGC ) for drug analysis." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080627.114511.

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Separation technologies have occupied a central role in the current practices of analytical methods used for drug analysis today. As the emphasis in contemporary drug analysis shifts towards ultra-trace concentrations, the contribution from unwanted matrix interferences takes on greater significance. In order to single out a trace substance with confidence from a rapidly expanding list of drug compounds (and their metabolites) in real complex specimens, analytical technologies must evolve to keep up with such trends. Today, the task of unambiguous identification in forensic toxicology still re

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36

Hutton, Matthew W. "EXTRACTION AND CHARACTERIZATION OF LIPIDS FROM MICROALGAE GROWN ON MUNICIPAL WASTEWATER." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/214.

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Based on results of its Aquatic Species Program (1978-1996), which sought to develop algae-to-liquid fuel technology, the U.S. Department of Energy has suggested that algal wastewater treatment may be incorporated into biodiesel production schemes to reduce the operating costs of both processes. the purpose of the current research was to evaluate the triglycerides produced by wastewater-grown algae for their suitability as a fuel feedstock and to investigate the effectiveness of several solvent mixtures and extraction procedures at recovering lipids from fresh algae. The research involved tw

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37

Chirita, Raluca-Ioana. "Développement de nouvelles méthodes séparatives compatibles avec une détection par spectrométrie de masse et par électrochimie pour l'analyse de traces de catécholamines et molécules apparentées." Thesis, Orléans, 2009. http://www.theses.fr/2009ORLE2043/document.

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Les catécholamines et les indolamines font partie de la famille des neurotransmetteurs. Un déséquilibre dans leur concentration peut être associé à différentes maladies telles les maladies de Parkinson et Alzheimer, la dépression ou la schizophrénie. C’est pourquoi le développement de méthodes de dosage spécifiques et très sensibles du fait de leurs très faibles teneurs dans les fluides biologiques est nécessaire. Dans un premier temps nous avons développé une méthode chromatographique en appariement d’ions (IP-LC) utilisant des colonnes C18 de nouvelle génération (monolithique et « fused core

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38

Wood, Philip Leslie. "The hydrodynamics of countercurrent chromatography in J-type centrifuges." Thesis, Brunel University, 2002. http://bura.brunel.ac.uk/handle/2438/5554.

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Countercurrent chromatography (CCC) is an advanced liquid-liquid extraction technique that purifies chemical components from complex mixtures. The Brunel CCC' is a J-type centrifuge based upon this technique. This machine can process 5g quantities of sample every 5 hours [Sutherland 1998]. To process 1 tonne of sample per year would require 200 Brunel CCCs, which is not practical as an industrial process. A practical alternative is to use one machine with 200 times the processing capability. To construct such a machine requires a greater understanding of the stationary phase retention inside a

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39

Ericsson, Victoria. "Development of a Size Exclusion Chromatography metod for analysis of extraction solutions from urinary catheters." Thesis, Uppsala University, Analytical Pharmaceutical Chemistry, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-124007.

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<p>This project focused on developing a Size Exclusion Chromatography (SEC) methodwith Refractive Index (RI) detection for analysis of extraction samples from urinarycatheters to detect compounds that can be extracted from the catheter during use.Mobile phases, extraction fluids and sample concentrations were varied, as well aspore sizes of the columns, to investigate the applicability of this technique forcharacterization of the coating and potential leachables. Analyses of extractionsamples showed that this method can be used for analyses of polyvinylpyrrolidone(PVP), which is the main compo

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Frazier, James Owen. "Investigation into the quantitative aspects of supercritical fluids as mobile phases for chromatography and extraction." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39906.

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Supercritical fluids were introduced as mobile phases for chromatography and extractions in the early sixties. Over the past decade the technique has received increased attention, largely owing to the introduction of several commercial instruments and to the ease of adapting available commercial equipment for use in sfe and sfc. This dissertation examines the use of supercritical CO₂ as a mobile phase for chromatography and extraction. The first chapter explores the problems and provides background for the research. The physical properties of supercritical fluids are described and pertinent re

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41

Hassett, Anthony John. "Analysis of volatile organic compounds in water by sorptive extraction and gas chromatography - mass spectrometry." Diss., University of Pretoria, 2001. http://hdl.handle.net/2263/26860.

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Saini, Gaurav. "Functionalization of Diamond and Its Application in High Performance Liquid Chromatography and Solid Phase Extraction." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2797.

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The primary focus of my work was to chemically functionalize diamond as normal and reversed phases for solid phase extraction (SPE) and high performance liquid chromatography (HPLC). Diamond was functionalized with -NH2 groups via self-limiting adsorption of an amine-containing polymer, polyallylamine (PAAm), onto oxidized diamond particles. The chemical stability of these particles was improved by thermal curing or chemical crosslinking with 1,2,5,6-diepoxycyclooctane. The reversed phase material for SPE was synthesized by reacting amine-functionalized diamond particles with long chain alkyl

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Alsudairy, Ziad. "Identification of Major Organic Constituents of Saffron Isolated by Solid Phase Extraction and Column Chromatography." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2019. http://digitalcommons.auctr.edu/cauetds/200.

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Water extracts of saffron, a spice derived from the plant Crocus Sativus L. obtained from India and Iran, were analyzed by liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS). The components in the extracts were separated on four different solid phase extraction cartridges with four different solvents and by silica gel column. Analysis was done by GC-MS, LC-MS and UV-Vis spectroscopy. The extracts separated into three distinct bands (two bright yellow and one orange) on the silica gel column. Based on GC-MS, the extracted compounds show many structu

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Xia, Yan 1971. "Supercritical fluid extraction of mogrosides from Siraitia grosvenorii." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101666.

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Mogrosides, the main active components in S. grosvenorii SWINGLE, are considered to be some 250 times sweeter than sucrose and to possess several medicinal attributes. Previous isolation processes used large quantities of toxic solvent that resulted in toxic residues of organic solvent in this high value food. Supercritical fluids fulfill the requirements of non-toxicity, recycle ability, and useful solvent characteristics. The work presented in this thesis is directed to the extraction of mogrosides from the powdered S. grosvenorii concentrate (SG) and the crude extract after resin treatment

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45

Heuvel, Remco Nicolaas Antonius Marian van den. "Investigation into the mechanics and feasibility of continuous counter-current extraction." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/6051.

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Continuous counter current extraction (CCCE) or dual flow counter current chromatography (DFCCC) is a promising technique where components can be separated continuously by two liquid phases that flow in opposite directions through a continuous length of coiled tubing. Specially designed end connectors and a coil planet centrifuge allow each respective phase to be pumped into each end of the tubing and the other phase to elute at each opposite end. In this thesis the feasibility and the mechanics of CCCE are investigated using stroboscopic photography on an experimental rig and a specially buil

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Minty, Brian. "Analysis of aqueous matrices using supercritical fluid extraction in conjunction with chromatographic spectroscopic and mass spectrometric techniques." Thesis, University of South Wales, 2004. https://pure.southwales.ac.uk/en/studentthesis/analysis-of-aqueous-matrices-using-supercritical-fluid-extraction-in-conjunction-with-chromatographic-spectroscopic-and-mass-spectrometric-techniques(fc38e7eb-053c-4a5b-86a4-7726ebccea97).html.

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The use and supply of various organic solvents for analytical chemistry is coming under scrutiny due to their environmental impact. International legislation now prevents the supply of "ozone depleting" solvents for laboratory purposes. Consequently alternative analytical methods to those which had previously relied upon the use of a range of organic solvents need to be developed. Supercritical fluids exhibit some properties associated with gases and liquids, and in particular their solvating characteristics are equivalent to a wide range of conventional organic solvents. Environmentally benig

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Mwenesongole, Ellen Musili. "Simultaneous detection of drugs of abuse in waste water using gas chromatography-mass spectrometry." Thesis, Anglia Ruskin University, 2015. http://arro.anglia.ac.uk/550378/.

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Sewage epidemiology is increasingly becoming an alternative method of estimating drug usage and consumption patterns for a given population. With the constant emergence of new psychoactive substances such as cathinones and piperazines, versatile, reliable, specific and sensitive analytical methods are needed for their detection in complex matrices such as waste water. This thesis reports the development of an analytical method based on solid phase extraction, derivatization with pentafluoropropionic anhydride and analysis by gas chromatography-mass spectrometry for the simultaneous analysis of

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Morrison, Erin R. "Can We Re-use “Single-Use” Solid Phase Extraction Cartridges?" Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/7065.

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Organic and inorganic compounds are present as contaminants in varying concentrations throughout our water cycle. Examples of these contaminants include the endocrine disrupting compounds (EDCs) bisphenol-A (BPA) and 17β-estradiol (E2) from plastics and pharmaceutical use. It can be necessary to obtain the concentration of these compounds within the water cycle for analysis by interested parties such as research groups, regulatory agencies, and private organizations. These concentrations, however, can be too dilute within the initial sample for analysis. Therefore it is nec

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Evers, Frank Richard. "Development of a liquid chromatography ion trap mass spectrometer method for clinical drugs of abuse testing with automated on-line extraction using turbulent flow chromatography." Thesis, University of Portsmouth, 2014. https://researchportal.port.ac.uk/portal/en/theses/development-of-a-liquid-chromatography-ion-trap-mass-spectrometer-method-for-clinical-drugs-of-abuse-testing-with-automated-online-extraction-using-turbulent-flow-chromatography(c047da7d-eb8a-41d0-ad1c-830deca531dc).html.

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Aims The method for the confirmation of drugs of abuse for addiction testing within King’s College Hospital prior to 2008 was a labour intensive thin layer chromatography method. To replace this with a faster method more suited to future requirements, the laboratory bought a liquid chromatography system with ion trap mass spectrometric detection. The development of the routine analytical method and the implementation of this method within the laboratory using on-line solid phase extraction and Turboflow® sample preparation will allow the laboratory to operate successfully in the field of clini

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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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