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Tesis sobre el tema "Chromatography"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

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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2

Power, Gillian Mary. "The study of chromatographic interactions using model reversed-phase chromatography surfaces." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285643.

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3

Galindo, Irma C. (Irma Concepcion). "Investigation Into the Causes for the Loss of Resolution in an Ion Chromatograpy Resin." Thesis, North Texas State University, 1988. https://digital.library.unt.edu/ark:/67531/metadc798197/.

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Four mechanisms were considered as possible causes of the loss in resolution for a Dionex CG2 ion chromatography resin: 1) presence of inorganic ions strongly bound to the active sites; 2) adsorption of organic species; 3) physical alterations; and 4) chemical alterations. The instrumental analyses used to gather data were ICP, FT-IR, SEM, solid C-13 NMR and IC. Based on the results, no metal ions are bound to the resin, no organic species are held onto the resin, and no physical change was observable. The cause for the loss of resolution is a strong reduction in the number of active sites in

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4

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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5

Kirk, John Daniel. "Particle beam LC/MS with fast atom bombardment." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/27127.

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6

Prazen, Bryan J. "Development of high speed hyphenated chromatographic analyzers and second order data analysis techniques /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11550.

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7

Cao, Liming. "Protein Separation with Ion-exchange Membrane Chromatography." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-050405-174109/.

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8

Meacham, Robert Ian. "Sorption-effect chromatography." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/27095.

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The objective of this work has been to develop an understanding of the changes in volumetric flow rate that occur during chromatography so that flow rate measurements can be used as the basis of an analytical method. It is suggested that the total amount of gas which adsorbs on a column equals the total amount of gas which elutes from the end of the column.

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9

Lyne, P. M. "Heater displacement chromatography." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376927.

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10

Yang, Wei. "Solids phase chromatography." Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505060.

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The present study focuses on the development of a novel technique, namely Solids Phase Chromatography (SPC), for particle classification and size analysis. SPC is a fractionation based technique and utilises a separation channel to fractionate the particle samples into sub-fractions according to their sizes. Subsequently, the products may be analysed by various detectors and recovered for other investigations.

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11

g, Fong Siong Fong. "Chemometrics and chromatography." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535216.

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12

Liddy, Alison Mary. "Multifunctional chromatography supports." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/594/.

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The aim of this study was to create a bi-layered packed bed chromatography support for the purification of nano-sized bioproducts. The effect of three different chemistry approaches, different solvent conditions, and microwave heating were investigated on construction of a bi-layered support. Sepharose CL-6B was activated with allyl glycidyl ether (routes 1&2). The inert outer layer was created in route 1 by reacting bromine with the allyl groups at the surface, followed by the addition of sodium hydroxide. Creation of the outer layer in route 2 was achieved by oxidation of surface groups with

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13

Mule, S. A. "Studies in chromatography." Thesis(M.Sc.), CSIR-National Chemical Laboratory, Pune, 1990. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3030.

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14

Tambe, A. S. "Studies in chromatography." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1992. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3041.

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15

Allyn, M. Liz. "Indirect photometric chromatography of iodide ion in aqueous solutions /." Online version of thesis, 1987. http://hdl.handle.net/1850/8769.

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16

Ley, Adrian. "Matrix gestützte Polymernetzwerke für die Anwendung in der konvektiven präparativen Chromatographie." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/11858/00-1735-0000-002E-E558-6.

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17

Al-Sayegh, A. J. "Determination of mixtures of sulfonamides by pyrolysis-gas chromatography following thin-layer chromatographic separation." Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379714.

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18

Colby, Christopher Brett. "Optimisation of scale-up of chromatography /." Title page, table of contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phc686.pdf.

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19

Wong, Victor, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "A fundamental study towards improving the performance of liquid chromatographic separation." THESIS_CSTE_SFH_Wong_V.xml, 2003. http://handle.uws.edu.au:8081/1959.7/467.

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The three factors of the resolution (Rs)equation(see Equation 1.1)were explored in this thesis. During the course of the research project, an important aim was to explore separation processes that would lead to an increase in productivity without sacrificing Rs. To that end, an increase in the retention factor (k)to enhance Rs was deemed detrimental to the cycle time, hence the production rate, particularly when preparative separations are involved. Consequently the primary objectives were to (i)prepare more efficient columns and (ii)investigate new strategies in manipulating selectivity. The

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20

Michelsen, Peter J. "Relationship between chromatographic retention and donor and acceptor numbers /." Online version of thesis, 1990. http://hdl.handle.net/1850/10688.

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21

Jedrzejewski, Paul T. "Investigation of mass spectrometric interfaces for supercritical fluid chromatography and liquid chromatography." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08282003-155244/.

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22

Fuchs, Géraldine. "Étude du fractionnement d'énantiomères par chromatographie a l'échelle semi-industrielle." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL031N.

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Contrairement aux autres méthodes enantiosélectives comme la cristallisation ou la conversion enzymatique, les procédés chromatographiques tendent à se généraliser grâce au nombre croissant de phases disponibles sur le marché; parallèlement la chromatographie chirale est surtout utilisée à l'échelle analytique, du fait du cout très élevé de ces phases, de leur faible capacité, et aussi de leur diffusion commerciale limitée. Dans ce travail, nous présentons des résultats expérimentaux obtenus à l'échelle préparatoire par deux procédés classiques d'élution (phase supercritique, phase gazeuse), a

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23

Marlot, Léa. "Développement de méthodes bidimensionnelles préparatives CPCxLC : application à la purification de molécules d'intérêt issues de matrices végétales." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1299/document.

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La chromatographie bidimensionnelle préparative suscite de plus en plus d'intérêt dans l'élucidation d'échantillons complexes car elle permet de collecter un grand nombre de molécules à haute pureté et quantitée récupérée. Bien que la chromatographie liquide (LC) soit souvent choisie en deuxième dimension, la chromatographie de partage centrifuge (CPC) à de multiples avantages qui en font une technique de choix pour la première dimension. Dans le but de purifier plusieurs molécules d’intérêt dans les matrices végétales, le couplage «comprehensive» CPCxLC représente une technique à fort potenti

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24

Shalliker, Ross Andrew, and mikewood@deakin edu au. "Studies on the behaviour of polystyrene in reversed phase chromatography." Deakin University. School of Sciences, 1992. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051125.112118.

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Polystyrene behaviour in reversed phase high performance liquid chromatography was influenced mainly by the solvent system, but secondary affects were observed depending on the stationary phase. A variety of reversed phase columns were investigated using mobile phase combinations of dichlorom ethane-methanol, dichloromethane-acetonitrile, ethyl acetate-methanol and ethyl acetate-acetonitrile. Several different modes of behaviour were observed depending on the polymer solubility in the solvent system. In the dichloromethane-methanol solvent system, polymer-stationary phase interactions only occ

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25

Borneman, Zandrie. "Particle loaded membrane chromatography." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/57597.

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26

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-electromecha

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27

Hensley, Jack Lee. "Capillary supercritical fluid chromatography." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/53623.

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The modification of a gas chromatograph for capillary supercritical fluid was demonstrated. The resulting instrument was used to characterize the performance of capillary columns manufactured specifically for SFC applications. The columns were tested for inertness, efficiency, and immobilization before and after extraction with the supercritical CO₂ solvent. Stable deactivation layers were obtained with polyethylene glycol pyrolysis of Carbowax 20M and Superox 20M. Crosslinking was evaluated with dicumyl peroxide (DCP) and azo-t-butane (ATB) as free radical initiators with OV-1701 as a station

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28

Mertzman, Melissa Danielle Foley Joe Preston. "Chiral microemulsion electrokinetic chromatography /." Philadelphia, Pa. : Drexel University, 2004. http://dspace.library.drexel.edu/handle/1860/340.

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29

Reiner, George Allen. "An explosive vapor generator based on capillary gas chromatography." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39761.

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30

Foster, Austin Richard. "Thermal Gradient Characterization and Control in Micro-Fabricated Gas Chromatography Systems." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7481.

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In order to make gas chromatography (GC) more widely accessible, considerable effort has been made in developing miniaturized GC systems. Thermal gradient gas chromatograpy (TGGC), one of the heating methods used in GC, has recieved attention over the years due to it's ability to enhance analyte focusing. The present work seeks to develop high performance miniaturized GC systems by combining miniaturized GC technology with thermal gradient control methods, creating miniaturized thermal gradient gas chromatography (µTGGC) systems. To aid in this development a thermal control system was develope

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31

Silwal, Indira K. C. "Characterization of Unknown Chemicals Using Gas Chromatography/Fourier Transform Ion Cyclotron Resonance Mass Spectrometry and AB-Initio Calculations." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/SilwalIKC2008.pdf.

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32

Ashraf-Khorassani, Medhi. "Supercritical fluid chromatography of nitrogen-containing compounds on packed columns." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/49919.

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The separation of basic nitrogen-containing compounds has been investigated via supercritical CO₂ and 1% methanol modified CO₂. Packed columns with the following stationary phases were employed: silica, octadecyl (C₁₈), propylamino (NH₂), and polystyrene-divinyl benzene (PRP). Without modifier the range of basicities which could be eluted increased in the order of silica < PRP < C₁₈ = NH₂. Chromatographic peak shapes and selectivity were much better with propylamino column. Different aromatic amines and azaarenes were successfully separated on both analytical scale and microbore propylamino bo

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33

Teepakorn, Chalore. "Numerical simulation and experimental study of membrane chromatography for biomolecule separation." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10299/document.

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La chromatographie membranaire est une alternative à la chromatographie classique sur résine basée sur le transport convectif des solutés à travers une membrane microporeuse plutôt que par le transport diffusif des solutés dans les particules de résines. Cette technique présente les avantages de diminuer les phénomènes de diffusion, de réduire les temps de séjour et les pertes de charge, et de permettre la purification rapide de quantités importantes de molécules. La chromatographie membranaire connaît un fort succès commercial. Une gamme importante de membranes chromatographiques mettant en j

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34

Jeong, Lena N. "Development of General Purpose Liquid Chromatography Simulator for the Exploration of Novel Liquid Chromatographic Strategies." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/5079.

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The method development process in liquid chromatography (LC) involves optimization of a variety of method parameters including stationary phase chemistry, column temperature, initial and final mobile phase compositions, and gradient time when gradient mobile phases are used. Here, a general simulation program to predict the results (i.e., retention time, peak width and peak shape) of LC separations, with the ability to study various complex chromatographic conditions is described. The simulation program is based on the Craig distribution model where the column is divided into discrete distance

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35

Williamson, Yuping. "Studies on concentration overload in micellar electrokinetic chromatography and peak overlap in gas chromatography /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1240704131&sid=7&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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36

Li, Zhiguo. "High-performance liquid chromatography analysis of fatty acids and mathematical modeling of liquid chromatography." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1179157379.

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37

Shapiro, M. "Design and characterisation of microlitre scale chromatography for the comparison with preparative scale chromatography." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/18783/.

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Ion exchange chromatography is a ubiquitous unit operation within bioprocessing. There are a large number of ion exchange resins, however there is limited time and material available for a full assessment. The work reported is primarily concerned with the microfluidic scale down of process chromatography. Microfluidic technologies offer the potential to investigate events occurring within the bed (such as adsorption profiles) that would be more difficult to observe in larger systems. In addition, the devices may be used for the investigation of adsorbent type, buffer type, pH, flowrate etc. by

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38

Gadgil, William Himanshu S. "Advances in DNA Affinity Chromatography." View the abstract Download the full-text PDF version, 2001. http://etd.utmem.edu/ABSTRACTS/2001-001-gadgil-index.htm.

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Thesis (Ph.D.)--University of Tennessee Health Science Center, 2001.<br>Title from title page screen (April 10, 2008). Research advisor: Harry W. Jarrett, Ph.D. Document formatted into pages (xv, 162 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 152-162).

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39

Wang, Mei. "Chromatography with no stationary phase /." Full text available from ProQuest UM Digital Dissertations, 2006. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=5&did=1383464751&SrchMode=1&sid=4&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1217274375&clientId=22256.

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40

Burton, Nicolas Paul. "Novel ligands for affinity chromatography." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359769.

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41

Perkins, John Robert. "Supercritical fluid chromatography/mass spectrometry." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375969.

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42

Al-Othmany, Dheya Shuja'a. "Tritium enrichment by gas chromatography." Thesis, University of Aberdeen, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240675.

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In the studies related to trace analysis in meteorology, hydrology, medical and clinical research, the measurement and monitoring of tritium released from nuclear facilities and its health physics aspects on human and the environment are of growing importance. The techniques employed currently for the enrichment of tritium are carried out using large samples and require long periods of operation (7 days or more) to obtain the enriched tritium sample. In the present investigation, a laboratory scale chromatography based system was designed, constructed and commissioned successfully to collect e

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43

Santori, Fabio. "Lectin affinity chromatography of monosaccharides." Thesis, University of Bath, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760807.

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44

Qian, Jianing. "Affinity chromatography of camelid antibodies." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610171.

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45

Chienthavorn, Orapin. "Detection in superheated water chromatography." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/32394.

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Superheated water has been used successfully as an eluent in liquid chromatography and has been coupled to various modes of detection, ultraviolet (UV), fluorescence, and nuclear magnetic resonance spectroscopy (NMR) and mass spectrometry (MS). A number of compounds were examined on poly(styrene-divinylbenzene) (PS-OVB), polybutadiene (PBO), and octadecylsilyl bonded silica (OOS) column with isothermal and temperature programmes.

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46

McGill, Robert Andrew. "Physicochemical measurements by gas chromatography." Thesis, University of Surrey, 1988. http://epubs.surrey.ac.uk/847792/.

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First the method of gas-liquid chromatography (GLC) has been used to obtain partition coefficients, K, at infinite dilution on polymeric and non-polymeric phases. About 30-40 solutes were studied per stationary phase. Secondly the method of gas-solid chromatography has been used to obtain adsorption isotherms for a series of adsorbents by the technique of elution by characteristic point (ECP). A single injection of a gas or vapour suffices to obtain the isotherm, and then the limiting Henry's law constant, Kh, for adsorption at low surface coverage. About 20-30 solutes were studied per adsorbe

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47

Polite, Lee Nicholas. "Studies in ion exchange chromatography." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54338.

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This dissertation investigates three major problems in IC, ranging from the practical to the theoretical. The first is of interest to the field of quantitative analysis. Since ion chromatography is primarily a quantitative technique, the linear range of the detector is of particular interest. The linear range was determined to be nearly five orders of magnitude for several common ions. The probes used were fluoride, chloride, sulfate, sodium, and potassium with concentrations ranging from 10 ppb to 1000 ppm. This portion of the dissertation describes the first attempt made to elucidate the lin

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48

Andersson, David. "Simulation Testbed for Liquid Chromatography." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185024.

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The stlc package is proposed as a tool for simulation of liquid chromatography by implementing several lumped kinetic models which combine diffusive mass transport and adsorption isotherm equations. The purpose of the package is to provide computationally efficient approximations to the general rate model of chromatography. Orthogonal collocation is used to discretize the spatial domain and the resulting system of ordinary differential equations is evaluated by one of several solvers made available in the package. Comparisons between numerical and analytical Laplace domain solutions for valu

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49

Maketon, Supachai. "Methods Development for Ion Chromatography." Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc330927/.

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Ion chromatography (IC) as developed by Small et. al. in 1975 has become an efficient and reliable analytical technique for simultaneous analysis of multiple ions in solution. The principle requirement prior to use the IC for an analysis is sample preparation; these include sample decomposition, solvent extraction, and trapping in case the target element is in the gas phase, etc. Solvent extractions for fluoride, chloride, sodium, ammonium, and potassium ions which are soluble in soils are described. Sample decompositions include silicate rocks using hydrofluoric acid for the determination of

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50

Otsuka, Koji. "FUNDAMENTAL STUDIES ON ELECTROKINETICK CHROMATOGRAPHY." Kyoto University, 1986. http://hdl.handle.net/2433/74676.

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