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 20 of 142 for “"Volatile Organic Compounds (VOCs)"”.
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Urinary Volatile Organic Compounds (VOCs) in the Diagnosis of Urothelial Bladder Cancer
… a detecting system for bladder cancer urinary volatile organic compounds (VOCs) biomarkers and explore its application in non-invasive diagnosis of bladder cancer. Urinary VOCs are a class of chemical compounds found in urine that generated from biological activities of cells, cancer cells have …
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Analysis of volatile organic compounds (VOCs) in soil via passive sampling : measuring partition and diffusion coefficients
… and semi-quantitative method in detecting volatile organic compound (VOCs) concentrations in soil vapors or water. Passive sampling for soil vapor takes an absorptive material and places it underground for a period of time to allow the VOCs to diffuse into the absorptive materials. In this …
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Quantitative analysis of volatile organic compounds (VOCs) in soil via passive sampling : polyethylene sampler design and optimization
The potential for the release of volatile organic compounds (VOCs) to our natural environment is pervasive. However, the ability to accurately measure and predict VOC soil vapor concentrations is still limited. A polyethylene (PE) quantitative passive sampler using performance reference compounds …
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Benchtop testing of polyethylene passive sampling towards a quantitative analysis of volatile organic compounds (VOCs) in soil vapours
… a passive sampler for quantitative analysis of volatile organic compounds (VOCs) was analysed in this work by means of a benchtop testing. A benchtop physical model was setup, which consisted of a jar of glass beads or sand, containing a known mass of toluene as the compound of concern (COC). A …
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An investigation of the production of volatile organic compounds (VOCs) by <i>Trichoderma</i> spp. and their mode of action against <i>Serpula lacrymans</i>
All living organisms produce volatile compounds that can have a significant effect on the ecological balance within their community. In wood, volatile compounds can build up and become toxic to other resident microorganisms. The major aim of this study was to evaluate the production of volatile …
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An investigation of volatile organic compounds in landfill gas
… this thesis contains the results on the study of volatile organic compounds (VOCs) in landfill gas from seven landfill sites in the western region of Melbourne, Victoria, Australia. Sampling methods including sampling with adsorption tubes, tedlar bags and cryogenic trapping were investigated and …
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Characterization of gas phase adsorption capacity of untreated and chemically treated activated carbon cloths
… activated carbon to remove low concentrations of volatile organic compounds (VOCs) from indoor air environments. In this research, activated carbon cloth (ACC) is examined for its equilibrium adsorption capacity for several VOCs of relevance to indoor air quality.
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Laboratory studies of the multiday oxidative aging of atmospheric organic aerosol
… quality and climate. However, the chemistry of organic aerosol (OA), which comprises a significant fraction of submicron atmospheric PM, is immensely complex due to the vast number of organic compounds in the atmosphere and their numerous reaction pathways. Laboratory experiments have generally …
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Investigating the influence of biosphere-atmosphere interactions on atmospheric chemistry and composition
… constituents, including ozone, aerosol, and Volatile Organic Compounds (VOCs). This thesis aims to address these uncertainties through a multifaceted approach, combining theory and data-driven models with observations. The scope of the research completed herein is introduced and described in …
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Analysis of Ambient VOCs Levels and Potential Sources in Windsor
… investigate the major sources of Windsor ambient Volatile Organic Compounds (VOCs). The annual average total VOC concentrations declined from 2005 to 2006. Summer concentrations were higher than winter in both years. All three models results indicated that vehicle-related sources were the major …
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Response of Stomoxys calcitrans and Musca domestica (Diptera: Muscidae) to Volatile Organic Compound Profiles from Ontario, Canada Dairy Farms
… management (IPM) approaches. We have sampled Volatile Organic Compounds (VOCs) at dairy farms in Southern Ontario, to determine important components of volatile profiles at such sites. Further, we have used Gas-Chromatography-Electroantennography (GC-EAG) to identify VOCs presenting …
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Preparation and Characterization of Palladium Catalysts
… catalysts to reduce emissions of toxic volatile organic compounds (VOCs) emitted from exhaust gas of gasoline combustion in automotive vehicles. Materials and systems currently available, such as the three way catalytic converter (TWC), have low activity below 400 °C in the catalytic …
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Monitoring and Inverse Dispersion Modeling to Quantify VOCs from MSW Landfill
… by bacteria. These biochemical reactions produce volatile organic compounds (VOCs) like methane and others. Due to heterogeneity in refuse composition, unpredictable distribution of favorable environmental conditions for bacterial actions and highly uncertain pathway of gases, estimation of …
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Exposure to Volatile Organic Compounds and Effect on Neurobehavioral Function.
… Range Study were analyzed to examine exposure to volatile organic compounds (VOCs). Self-reported contact to chemical products and blood concentrations of specific chemicals were analyzed. Neurobehavioral function was assessed by simple reaction time test (SRTT), symbol digit substitution test …
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Measurement of lipid peroxidation in biology models using gas-chromatography-aass spectrometry
… were connected to a cryofocusing unit to trap volatile organic compounds (VOCs). The VOCs were eluted from the trap by capacitive discharge into a gas chromatograph with time-of-flight mass spectral capabilities (GC-TOFMS) and were found to include the lipid peroxidation product hexanal. The …
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Life cycle cost modeling of automotive paint systems
… also results in the emission of polluting volatile organic compounds (VOCs). New paint technologies based upon powder coatings offer reductions in VOC emissions along with potentially reduced energy usage and the ability to reuse paint overspray. However, quantification of these advantages …
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Evaluation of filter pack dewatering on Voc concentrations in a simulated low-yield monitoring well
… process effects the concentration of dissolved volatile organic compounds (VOCs). It was hypothesized that losses of VOCs would be observed as a result of an increased air-water interface and possibly turbulent flow through the filter pack during water-level recovery; Little or no measurable …
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EXAMINATION OF VOLATILE ORGANIC COMPOUNDS ASSOCIATED WITH HUMAN DECOMPOSITION BYPRODUCTS IN SOIL
… human remains release naturally produced volatile organic compounds (VOCs) that are specific to the process of decay. These VOCs can act as markers that indicate remains are present [1] and presumably can be used to indicate whether or not remains were once present in a given location, …
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Demonstrating the feasibility of polyethylene passive samplers for quantitative assessment of volatile organic compounds in soil
… assessment of the nature and extent of volatile organic compounds (VOCs) in soil vapors is a valuable tool, as these chemicals are pervasive and a health concern at many contaminated sites. Motivated by the successful use of polyethylene (PE) passive samplers in sediments, this research …
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