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 17 of 17 for “"exposure pathways"”.
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Selenium bioaccumulation and speciation in the benthic invertebrate Chironomus dilutus: an assessment of exposure pathways and bioavailability
… invertebrate Chironomus dilutus to identify the exposure pathway(s) and selenium species associated with the bioaccumulation of selenium by benthic invertebrates downstream from the Key Lake operation. Laboratory bioaccumulation tests that exposed midge larvae to 4.3 μg/L as dissolved selenate …
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Indigenous Resource Management and Environmental Contamination
… dependent upon concentration and duration of exposure to the contaminant. This study lists the human health effects of 5 heavy metals; copper, arsenic, cadmium, lead and mercury, and discusses the need for studies to identify potential exposure pathways that are associated with a Native …
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Evaluation of the degradation of per- and polyfluoroalkyl substances (PFAS) using UV-activated silica-based granular media (UV/SGM)
… concentrated PFAS waste causes additionally exposure pathways through landfill leachate, which can migrate into groundwater, and eventually back to drinking water. Breaking down the recalcitrant fluorinated organics into inorganic species allows for mitigated risk during treatment and …
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Influence of natural and anthropogenic factors on Water, Sanitation, and Hygiene (WaSH)
… interaction between water microbiome and human exposure to water pathogens. Furthermore, programs like WaSH intervention targeted to change the hygiene behavior of individuals, potentially change the water microbiome but the current knowledge is not adequate to validate it. Thus, the overarching …
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The effects of bicarbonate and mineral surfaces on uranium immobilization under anaerobic conditions
… toxic, is insoluble which greatly reduces its exposure pathways. We seek to examine the role of ferric iron on U(VI) reduction by adsorbing U(VI) onto ferric and non-ferric mineral surfaces in the presence of a reductant. Further, we seek to understand the role that NaHCO3, a natural …
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Identification and characterization of gene and microRNA networks associated with cancer survival and drug abuse
… cancer survival to be inferred. Illicit drug exposure brings about changes in the brain transcriptome that result in the dysregulation of pathways. To detect the progression of drug exposure pathways, meta-analysis of five individual microarray experiments measuring gene expression in the …
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Trace element abundance and human epidemiology in Northern Ireland: the Tellus case study
… together with the presence of relevant human exposure pathways, mayexplain the spatial variability of certain disease patterns. It has been recognizedthat besides anthropogenic impacts, the diversity of bedrock geology and mineraldeposits primarily leads to similarly diverse trace element …
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Bioaccessibility of metals in soils in selected parks in Montreal
The main focus of this study was to determine the concentrations and bioaccessibility of metals in Montreal city parks. Surface soil samples were collected from nine parks located across Montreal city and analyzed for total metals, pH, carbon content and bioaccessibility. Metal concentrations were …
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Chemical exposures in drinking water: contaminant analysis and physicochemical behavior
Environmental chemical exposures pose an understudied risk to human health. The quality and accessibility of data on occurrence in the environment and physicochemical behavior of industrial chemicals are integral for accurate exposure risk assessment. In this dissertation, analytical chemistry …
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Chemical Contaminants in Drinking Water: An Integrated Exposure Analysis
… of this research is to develop an integrated exposure model, which performs uncertainty analysis of exposure to the entire range of chemical contaminants in drinking water via inhalation, ingestion and dermal sorption. The study is focused on a residential environment. The various water …
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Compound Events and Exposure Science: Characterizing Mixtures and Assessing Cumulative Risks Using Participatory Research Methods
… communities face disproportionate contaminant exposure due to systemic inequities, industrial proximity, and inadequate regulatory protections, with climate change further exacerbating these risks. This work explored environmental exposure in a diverse range of environmental justice …
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Uncertainty analysis in ecological risk assessment modeling
… levels, and a comprehensive evaluation of exposure pathways. To verify this model, ecological risks from Cr, Ta, Mo and DU exposure at the U.S. Army Yuma Proving Ground (YPG) and Aberdeen Proving Ground (APG) were assessed and characterized. For the case of DU exposure to YPG terrestrial …
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Copper exposure of freshwater mussels (Anodonta anatina): Some physiological effects
… This research aims to study the relevance of Cu exposure pathways on its uptake, distribution, bioaccumulation, and elimination in the freshwater mussel A. anatina and its various potential physiological impacts. The work is started with raising Cu-loaded algae using the stable isotope 63Cu as …
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Evaluation of strategies for rehabilitation of selected abandoned/historic mine sites in the Giyani Greenstone Belt, Limpopo Province of South Africa
… The scoring focused on the source of the hazard, exposure pathways, and possible damage that might be caused by the hazard. Analytical Hierarchy Process (AHP) and Pugh Matrix were used to devise a multi-criteria framework for evaluating mine site rehabilitation strategies. AHP method was utilized …
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Potamanautes warreni biomarker assays to monitor silver nanomaterial contaminants in aquatic environments
… difficult to accurately assess the potential exposure pathways to ecological receptors. Of all NMs, silver nanoparticles (AgNPs) are the most widely used NPs, present in several consumer products mainly because of their anti-bacterial properties. It is estimated that the annual production …
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Determination of illegal and toxic ingredients in face creams
… on the concentration of the metal, intake rate, exposure frequency and duration, body weight, and averaging time. The cancer risk is then calculated by multiplying the ADD by the CSF, which represents the probability of developing cancer per unit of exposure. Risks are typically expressed as a …
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Mercury Concentrations in Snowy Plovers and Sediments of their Breeding Environments in the Southern Great Plains
… may also be vulnerable to elevated contaminant exposure, such as mercury (Hg), in these environments. Presently, there is a paucity of published research regarding Hg exposure for avifauna inhabiting saline lake and alkali flat environments of the SGP.</p> <p>The health consequences of Hg …