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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 79 for “"ion chromatography"”.
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Development and characterisation of monolithic silica stationary phases for ion chromatography
… monolithic HPLC columns have received much attention in recent years, particularly those modified for reversed-phase separations. However, for ionexchange, silica based monolithic columns have received only limited attention. Therefore, the aim of this work was the development and characterisation …
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Inorganic and organic speciation of atmospheric aerosols by ion chromatography and aerosol chemical mass closure
… (1) to measure major and minor inorganic ionic constituents by ion chromatography (IC) in atmospheric aerosol samples; (2) to determine low molecular weight dicarboxylic acids (DCAs) and methanesulphonate (MSA-) by IC and to assess their contribution to the water-soluble organic carbon …
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Quantification of Airborne Fungal Spores Comparing Molecular Tracers via Ion Chromatography and UV-LIF Methods
… as effective ice nuclei and giant cloud condensation nuclei in some cases. This has implications on the hydrological cycle on local and regional scales by impacting the formation and evolution of clouds and precipitation. The quantification of fungal spores has been limited in the past due to …
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Investigations of and performance improvements in the mercury thiourea complex ion chromatography method for mercury speciation analysis
The Hg thiourea (TU) complex ion chromatography (HgTU-IC) method for mercury speciation analysis, first developed at UIUC, was the subject of an in depth investigation aimed at i) understanding the causes of system performance problems, ii) optimizing its chemistry, and iii) coupling it to ICP-MS …
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Comparison of ion chromatography and flow injection analysis methods for monitoring chlorite and chlorate ions in drinking water
Up-coming regulations on chlorine dioxide in drinking water treatment require low level measurement of chlorite ion (CI0₂-) and chlorate ion (CI0₃-). This research investigated analysis of CI0₂- and CI0₃-; in drinking water by flow injection analysis with iodometric detection (FIA) and ion …
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Measurement of inorganic arsenic and chromium species in southern Nevada groundwater using ion chromatography-inductively coupled plasma mass spectrometry
Two analytical methods employing an ion chromatograph-inductively coupled plasma mass spectrometer were used to separate inorganic arsenite from arsenate and trivalent from hexavalent chromium in southern Nevada groundwater. Method detection limits were found to be 0.011 ppb and 0.005 ppb for …
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Mercury-Thiourea Complex Ion Chromatography With on-Line Cold Vapor Generation and Atomic Fluorescence Spectrometric Detection (hgtu/ic-Cvafs)
Two specialized sample preparation chemistries were developed to be used with the sample introduction methods of the HgTu/IC-CVAFS system: one for biotic tissues, and one for sediments. A digestion system for the simultaneous measurement of MeHg and HgII in biota samples using sequential HNO3 …
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Three Hundred Year Record of Part Per Trillion (PPT)-level Perchlorate Measured with Ion Chromatography with Tandem Mass Spectrometry (IC - MS/MS)
… a nonvolatile, highly polarizable anion, has been found in ground water and soil. Human exposure to perchlorate through food and water constitutes a human health threat because perchlorate inhibits iodide intake needed by the thyroid gland for proper central nervous system development …
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Studies in ion exchange chromatography
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 …
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The Determination of Trace Metals by High Performance Liquid Chromatography with Photometric Detection
… is recognised that improved methods of determination are required. High performance liquid chromatography has grown in importance as a technique, especially since the synthesis of better column packings. The adaptability of reverse phase and ion chromatography with new post-column reagents for …
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An investigation of the factors affecting the degradation of cellulose acetate artefacts in museum collections
… an increasingly important part of museum collections. These plastics are already exhibiting signs of degradation, which raises the question of how they should be stored and treated. However, little is known about the specific degradation processes which occur. Further research is required because …
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IODINE SPECIATION IN MARINE AEROSOL
… the marine boundary layer such as ozone destruction and new aerosol particle formation. Iodine has a complex chemistry in the gas and aerosol phases and to date, what controls iodine speciation, the interactions and roles of individual iodine species are not well understood. This research aims to …
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Thermal Decomposition Mechanisms of Per- and Polyfluoroalkyl Substances and Application to Analysis of Total Organofluorine
… in the environment due to their wide application in consumer products and aqueous film-forming foams (AFFFs) for over 70 years. The likelihood of exposure in combination with the potential for adverse ecological and health effects has caused tremendous concern.Thermal treatment of PFASs has …
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Development and application of isotopically-selective assays for nitric oxide metabolites.
… importance of nitric oxide (NO) in neurotransmission, immunological defense, and as a vasodilator in the regulation of blood pressure is well known, so there is a high interest in methodology for NOS turnover measurements, or methods that help to discover new metabolites of nitric oxide. Use of …
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Distribution and causes of high fluoride groundwater in the western Bushveld area of South Africa
… in groundwater originated from the dissolution of fluorine-bearing minerals, principally fluorite, mica, amphibole and apatite, and that high F- groundwater would be hosted in rocks with a high fluorine (F) content. It was further hypothesised . that groundwater residence time, rare …
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A Study of the Behavior of Chlorine and Organic Compounds During Combustion in an AFBC System
… understand the behavior of chlorine and the emission of organic compounds during combustion in an atmospheric fluidized bed combustion (AFBC) system. Inefficient, uncontrolled use of coal gives rise to organic emissions which can be detrimental to health. The chlorine in coal may cause corrosion …
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INVESTIGATION OF CHELATING DYE IMPREGNATED RESINS FOR THE ION CHROMATOGRAPHIC DETERMINATION OF TRACE METALS
A high-performance chelation ion chromatography (HPCIC) system using chelating dye impregnated resins for the determination of trace metals in various complex matrices is described. The parameters involved in the production of dye impregnated chelating columns have been identified and optimised, A …
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IDENTIFICATION AND QUANTIFICATION OF IONIC POLLUTANTS IN ENVIRONMENTAL WATER
This dissertation depicts research efforts aimed at developing analytical methods for the determination of both cationic and anionic pollutants in environmental water. In chapter 2, a DNA-based molecular beacon fluorescent sensor was demonstrated for the detection of a cationic pollutant, namely …
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Packed capillary columns for liquid chromatography
… capillary columns for high performance liquid chromatography are examined. Historically, the advantages are smaller sample and phase consumption, enhancement in sensitivity, easy column synthesis, higher obtainable efficiency, and easier interfacing to other techniques. These points are …
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Potential use of ultrasound in chemical monitoring
… was to examine the potential of combining sonication with other technologies for monitoring specific classes of organic pollutants in water. The research specifically addressed using ultrasonic processors to decompose organochlorine compounds into ions which could be detected using a specific ion …
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