Global ETD Search
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 8 of 8 for “"Compound specific isotope analysis"”.
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Evolution and degradation pathways of landfill leachate DOC and detection of groundwater landfill-leachate contamination using compound-specific isotope analysis
… Here I use a new analytical technique for the analysis of 13C in specific compounds of DOC in leachate from the Trail Road Landfill (TRL) site, Ottawa, Ontario, in order to better characterize its biogeochemical and isotopic evolution during degradation; to determine methanogenesis pathways; …
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Evaluating the natural attenuation of synthetic organic chemicals in a chalk aquifer
… biodegradation in the aquifer (of SULPH) using compound specific isotope analysis. Based on the historical data and ex-situ microcosms IPU biodegradation was found to be occurring at the site; albeit at very low levels (2 %). It is suggested that the high concentrations of other contaminants at …
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ADVANCING METHODS FOR APPORTIONING THE SOURCES OF SEDIMENT IN RIVERS: COMBINING SPECTROSCOPY AND STABLE ISOTOPES WITH BAYESIAN MIXING MODELS
… in sediment fingerprinting practice, specifically relating to difficulties in producing high-temporal resolution apportionment estimates, inconsistencies in mixing model uncertainty representation, and a lack of attention given to organic matter provenance. Addressing these …
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Development and Application of An Integrated GC-MS/MS and GC-IRMS Analytical Approach in Food Quality Evaluation
… structures and concentrations. Among these compounds, volatile organic compounds (VOCs) play a fundamental role in defining the characteristic aroma and flavour profiles of plants. Because of their economic value and chemical complexity, plant-derived flavourings are frequently subject to …
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Investigating Controls on Variation in Isotopic Fractionation during Biodegradation of Chlorinated Ethenes and Ethanes
Kinetic isotope effects occur due to different reaction rates for light and heavy isotope-containing molecules, and are controlled by the bonds broken during degradation. For many primary pollutants, stable carbon, hydrogen, and chlorine isotope effects have been found to fit a Rayleigh model, …
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Trophic relevance of gelatinous zooplankton for commercial fisheries in the Irish Sea
… predominantly employ trophic investigation and analysis to assess fish-jellyfish predator-prey interactions in the Irish Sea. Chapter three investigates jellyfish inter-tissue isotopic variation and discusses whether tissue and/or size-based isotopic grouping are suitable parameters for the …
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Metabolic Pathways of Amino Acids, Monosaccharides and Organic Acids in Soils assessed by Position-Specific Labeling
… steps. This thesis aims to establish position-specific isotope labeling as a tool in soil science to trace the pathways of LMWOS transformations. In a mediumterm field experiment six position-specific 13C-labeled LMWOS from the three main LMWOS classes were applied: two amino acids (alanine and …
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The Use of Biomarker and Stable Isotope Analyses in Palaeopedology / Reconstruction of Middle and Late Quaternary Environmental and Climate History, with examples from Mt. Kilimanjaro, NE Siberia and NE Argentina
… proxies are traditionally applied, e.g. texture analysis, numeric dating methods and mineral analysis. The aim of this dissertation is to evaluate the potential of biomarker and stable isotope analyzes. Specifically, I focused on plant leaf wax-derived n-alkanes, amino acid enantiomers, stable …