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 22 for “"Methyl Mercury"”.
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Benefits of Seafood Consumption Versus Risks of Methyl Mercury: Does Consumption Warrant Concern?
… risks of contaminants in seafood, particularly methyl mercury, and its impacts on human health. The health of the public must be protected and it is currently unclear that seafood advisories are adequately meeting this requirement. Consumption advisories are widely used in the United States and …
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A Field and Modeling Assessment of Methyl Mercury Accumulation in an Engineered Retention Pond
<p>The accumulation of methyl mercury (MeHg) in lakes during summer stratification has been demonstrated to affect biotic mercury (Hg) accumulation. However, small, shallow polymictic lakes can experience short-term stratification and mixing events that are largely unstudied in their abilities to …
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Geochemical Controls on Mercury Methylation in Backwaters of a Gulf Coastal Plain River System, Implications for Water Column Processes
<p>The abundance and distribution of mercury and methyl mercury were investigated at three sites in the lower Ouachita River in the summer of 2010 in an effort to provide the first characterization of the extent of mercury contamination in this river system, and to investigate the potential for …
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The effects of moist and dry heat cooking upon mercury levels in breast tissue and the distribution of mercury in organs of McGraw Mallard ducks administered methyl mercury chloride
Thesis (M.S.)--Michigan State University. Dept. of Food Science and Human Nutrition, 1972
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The determination of mercury and its organo compounds by high performance liquid chromatography-atomic flourescence spectrometry.
… sediments samples for the determination of total mercury by cold vapour atomic fluorescence spectrometry were investigated. Satisfactory results were obtained from a closed microwave digestion procedure for which 0.5g of soil or sediment sample was taken and heated with 3 mL of nitric acid and 1 …
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The separation of ionic and organic mercury from water using milk proteins, xanthates and keratin
The interaction and removal of divalent mercury, monomethyl mercury and dimethyl mercury from water solutions with milk proteins, xanthates, and structural proteins have been investigated. Milk proteins, including lactalbumin, casein, whey and whole milk were tested in concentrations of one part …
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Determination of trace elements in hair for monitoring environmental and occupational exposure
… of antimony, arsenic, cadmium, chromium, lead, mercury and selenium in human hair by ICP-MS were developed. Chemical speciation of mercury and methyl mercury in hair was also achieved using LC-ICP-MS. For the digestion of hair samples the optimum method for these elements was found to be a …
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THE DETERMINATION OF TRACE METALS BY CAPILLARY ELECTROPHORESIS
… for the determination of inorganic and organo mercury species as their dithizone sulphonate (DzS) complexes using coated capillary columns is described. The complexes were pre-formed before injection and detection was by direct measurement of the visible absorbance of the complexes. Dithizone …
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A Seat at the Table: A Nonconformist Approach to Grassroots Participation in the Articulation of Health Standards
… with a fear of ecosystem toxicity, specifically methyl-mercury toxins in regional flora and fauna, has resulted in high stress and anxiety levels among community members relying on traditional foods for sustenance at Walpole Island First Nation.
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Abiotic pathways of mercury methylation in the aquatic environment
This thesis studies the chemical reactions of mercury in different oxidations states with several natural methyl-donors present in the aquatic environment. The importance of the abiotic pathway of mercury methylation was assessed by a thorough examination of the kinetics of these reactions in …
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Remediation options for mercury-contaminated sediments within the Yuba River watershed
… Bay. The research evaluates pathways for mercury entry into the watershed and potential remediation technologies to reduce the risk of future mercury contamination from hydraulic mining debris. Remediation technologies for the Yuba Goldfields and Englebright Reservoir are discussed and …
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Recovery status and chemosensory cues affecting reproduction of freshwater mussels in the North Fork Holston River downstream of Saltville, Virginia
… observed in 1918, to one species in 1974 due to mercury pollution. To determine the degree of recovery of mussels in the NFHR downstream of Saltville, and to provide recommendations for future mussel translocation sites, 19 sites were surveyed using a snorkeling catch-per-unit-effort (CPUE) …
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Mercury distribution in the sediments of the South River, Virginia
… was undertaken to determine the distribution of mercury in the sediments of the South River for 16 km. below a synthetic fibers plant in Waynesboro, Virginia, which discharged mercury to the river system from 1929 to 1950. The downstream distribution was examined by comparing the results of total …
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Estimating the environmental costs of the hydro fuel cycle using life cycle assessment techniques and economic valuation
… include methane (CH4), carbon dioxide (CO2) and methyl mercury (MeHg), which are primarily associated with microbial activity in reservoirs. In the impact assessment, economic valuation is used to estimate the environmental impact associated with emissions from the hydro fuel cycle. Estimates of …
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Novel Methods For The Analysis Of Organometallic compounds For The Natural Environment
… was optimised for the detection of organomercury and organotin compounds utilising a single variable factor approach. Methods of analysis were developed for organomercury compounds in doped sediments and doped samples of fish muscle. This utilised element specific detection which is …
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Quantifying the health and economic impacts of mercury : an integrated assessment approach
Mercury is a toxic pollutant that endangers human and ecosystem health. Especially potent in the form of methyl mercury, exposure is known to lead to adverse neurological effects, and, a growing body of evidence suggests, cardiovascular ones. Mercury's health impacts have economic consequences, and …
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Dissolved Organic Matter Characterization and Impact on Mercury Binding in an Urbanizing Watershed
… controlling the bioavailability and transport of mercury (Hg) and other trace metals through complexation. The complexation of ionic Hg (Hg<sup>2+</sup>) with DOM can either limit methyl mercury (MeHg) bioavailability or increase MeHg production by stimulating microbial growth. While substantial …
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Artisanal whaling in the Atlantic: a comparative study of culture, conflict, and conservation in St. Vincent and the Faroe Islands
… operations may be threatened by the presence of methyl-mercury and other environmental pollutants in the tissues of the whales, which have been shown to have negative effects on human health. Additionally, both societies have had to negotiate the efforts of anti-whaling organizations, who employ …
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Geochemical controls on production and transport of methylmercury in the St. Louis River Estuary
The production of methylmercury (MeHg) in freshwater systems is a concern due to its bioaccumulative properties in aquatic food webs and potential neurotoxicity of consumers of fish, including predatory fish, wildlife, and humans. Transformation of inorganic mercury to MeHg is primarily driven by …
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Voltammetric and other properties of methylmercury compounds and distribution of methylmercury in environmental samples
<p>The reduction of aqueous methylmercury solutions has been studied using polarography and cyclic voltammetry at the dropping mercury electrode. By scanning a broad range of pH, pCl and methylmercury concentrations, a detailed reduction mechanism has been proposed. Reduction is shown to proceed in …
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