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 159 for “"trace metal"”.
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Trace Metal Biogeochemistry in the Western North Pacific
… and central North Pacific.</p> <p>Dissolved trace metal concentrations were measured using a novel isotope dilution-ICP-MS method after extraction over an 8-hydroxyquinoline resin column and validated through the use of the SAFe consensus reference materials. Filtered suspended particulate …
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The trace metal geochemistry of suspended oceanic particulate matter
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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Sources of variability in trace metal bioaccumulation by fish
… and channel catfish were collected in 1982 from metal-contaminated Peak Creek, Virginia. Whole-body and tissue concentrations of cadmium, lead, and zinc were determined by atomic absorption spectrophotometry. Variations in metal concentrations within each species were related to duration of …
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Trace Metal-Particle Water Interactions in the Western North Sea
The distribution of trace metals (Fe, Mn, Cu, Cd and Pb) has been determined in dissolved and particulate phases, along with relevant hydrographic parameters, from the nearshore coastal zone of the western North Sea (between 52ON and 56ON) during four Land Ocean Interaction Study (LOIS) surveys …
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Characterization of Trace Metal Leaching from Maryland Coal Fly Ashes
Three coal fly ashes with different acid-base characteristics and their mixtures with an embankment soil were analyzed for arsenic, copper, and chromium leaching as function of pH using batch-type water leach tests (pH 4-10). Leach tests results showed that significant Cu release occurred only at …
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Trace metal sources for the Atlantic inflow to the Mediterranean Sea
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1989.
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Influence of genetic obesity on essential trace metal status and metabolism
Essential trace metal status in obese (ob/ob) mice and their lean(+/+ and +/?) littermates was assessed by measuring the concentrations and total levels of Zn, Fe, Cu and Mn in several tissues. Data indicated that the concentrations of these metals were significantly lower in several tissues from …
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Pore water biogeochemistry and trace metal dynamics in deep intertidal flat sediments
Biogeochemical processes were studied in deep pore waters at different locations in the backbarrier area of Spiekeroog Island, Germany. A multilevel in situ pore water sampler was developed, which allows pore water sampling down to 5 m sediment depth. Sulphate, DOC, and nutrients were studied for …
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Molecular and physiological investigation of trace metal stress in seagrass, Zostera muelleri
… loss along the Australia and New Zealand coasts. Trace metal pollution and most specifically copper (Cu), have been previously reported in industrial, agricultural and domestic run-off waste which often finds their way to the ocean and jeopardise the health of the seagrass meadows. Although we …
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Trace metal accumulation in urban sediments, Black River, Western Cape, South Africa
The increase in urbanisation and the use of metal compounds and products domestically and in industry has resulted in the production of by-products and wastes, which needs to be evaluated in the urban environment. The discharge of some of these wastes into urban rivers should be evaluated to …
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Trace metal effects on ectomycorrhizal growth, diversity, and colonization of host seedlings
… sites. This dissertation examines the effects of trace metals and soil disturbance on ectomycorrhizal fungi in the laboratory and the field. The first experiment assessed Cu and Zn impact on growth of three ectomycorrhizal species in pure culture. Suillus granulatus and Pisolithus tinctorius were …
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Trace Metal Concentrations across Trophic Levels in Cotton Fields of Xinjiang Province, China
<p>Trace metals become concentrated in urban and peri-urban soils with the use of agricultural practices and industrial emissions. Fertilizers, liming, sewage sludge, and irrigation water contain metals which accumulate in agricultural fields and pose a risk to humans and wildlife. Coal plants and …
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Impacts of trace metal pollution, urbanization and aquifer recharge on Spokane River macroinvertebrates
… River to determine: 1) accumulation of toxic trace metals in macroinvertebrate tissue, 2) effects of aquifer recharge, and 3) impact of urbanization. I predicted that aquifer inflows of cold, clean water would mitigate effects of pollution, and that reaches above the City of Spokane would be …
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Trace metal effects on phytoplankton in subpolar seas with special emphasis on coccolithophores
… (nitrate, phosphate) and micronutrient (trace metal) or how this impacts on their competition with other phytoplankton groups (e.g. diatoms, Synechococcus). Hence, this study investigated the response of coccolithophores to trace metal (iron, zinc and cobalt) additions in the high …
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Factors affecting the response of marine and estuarine bacterial communities to trace metal enrichment
Studies of the effects of trace metal perturbation on microbial communities have, to date, concentrated on contaminated environments, single phylotypes or single metals. The effects of trace metals on bacterial communities in estuarine and marine environments have been largely overlooked. The aim …
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Resolving the Structure, Morphology, and Trace Metal Association of Nanominerals: The Case for Schwertmannite
Schwertmannite, a ferric oxyhydroxysulfate mineral typically found under acidic, high sulfate and iron aqueous conditions, such as acid mine drainage environments, was studied using analytical high resolution transmission electron microscopy (HRTEM). HRTEM offers advantages over bulk techniques …
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