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 29 for “"metal speciation"”.
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XAS studies of metal speciation in hydrothermal fluids
Knowledge of metal speciation and thermodynamic properties underpins our capability to model metal transport and deposition in natural and engineered systems. Using synchrotronbased X-ray Absorption Spectroscopy and high temperature – high pressure experimental techniques, this project aims to …
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Modeling contaminant transport in polyethylene and metal speciation in saliva
… between contaminants and polymers. The metallic flavor of copper in drinking water influences the taste of water and can cause the taste problems for water utilities. The mechanism of metallic flavor caused by these metals is related to free or soluble ions. Free copper concentrations …
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The Development of High Accuracy Methods for the Measurement of Metal Speciation
… The spike was shown to be stable. An oyster metallothionein (MT) was also produced using recombinant techniques. Methylmercury (MeHg) was determined in an International Measurement Evaluation Programme (IMEP) laboratory intercomparison tuna fish test sample, IMEP-20 tuna material. External …
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A study of certain trace metals in sea water using anodic stripping voltammetry
… and applied for the direct analysis of the metals, Zn,J Cu, Pb, and Cd in sea water. The electrode was observed to follow theoretical behavior for thin film electrodes and the technique was found not to be adversely affected by dissolved organic material in sea water. Good precision (ca., …
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Assessing water quality in Sultanate of Oman using a newly developed dynamic speciation technique
… activities, have often produced point sources of metal and organic contaminations in the local marine systems. Although advances have been made in measuring and understanding the trace metal speciation in aquatic system using a dynamic technique DGT (Diffusive Gradients in Thin-films) or using …
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Geomycology: fungal bioweathering, bioleaching, bioprecipitation and biotransformation of metals and minerals
… biotransformations and biogeochemical cycling, metal and mineral transformations, decomposition, bioweathering, and soil and sediment formation. Fungi can apply various mechanisms to effect changes in metal speciation, toxicity and mobility, mineral formation and/or mineral dissolution. This …
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Copper speciation in estuaries and coastal waters
… improved a commonly used approach to determine metal speciation (competitive ligand exchange adsorptive cathodic stripping voltammetry, CLE-ACSV). Using this new approach to chemical Cu speciation and an old approach to physical Cu speciation (filtration), I show that riverine humic substances, …
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Copper and Zinc Speciation in the Tamar Estuary
The chemical speciation of trace metals controls their potential bioavailability and therefore toxicity to exposed organisms. Despite previous studies demonstrating the ameliorative effects of dissolved organic carbon (DOC) on metal toxicity, the effectiveness of ligands from varying sources and of …
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Impacts of microbial activity on trace metal behavior during the bioremediation of phenanthrene-contaminated soils
… (200 mg kg\(^{-1}\)) from soil containing both metals and phenanthrene, over 29 days. Bioremediation of phenanthrene and its effects on trace metal behaviour has been investigated. Metal behaviour studied includes metal speciation and the kinetics of exchange between solution and solid phase and …
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River Sediment Sampling and Environment Quality Standards: A Case Study of the Ravensbourne River
Sediment is a major sink for heavy metals in river, and poses significant risks not only to river quality but also to aquatic and benthic organisms. At present in the UK, there are no mandatory sediment quality standards. This is partly due to insufficient toxicity data but also due to problems …
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A Novel, Ultra-Fast Electrochemical Tool To Study Speciation Of Trace Metals In Aqueous Solution
<p>Trace metals play important roles in biological and ecological systems. In biology, trace metals act as catalytic or structural cofactors and regulate biochemical processes. In the environment, natural and anthropogenic sources of trace metals mobilized into natural waters where they can create …
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Investigation of Lead Hydrolytic Polymerization and Interactions with Organic Ligands in the Soil/Sediment-Water Environment
… of this research was to investigate lead speciation in the soil/sediment-water environment and to better understand how the species affect lead mobility under different environmental conditions. The research involved both field soil and sediment samples as well as standard lead solutions. …
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The origin and behaviour of carbonate minerals in diverse environments: from subduction zones to asteroids
… and solubility of carbonates and associated metal speciation was assessed under subduction zone conditions by different in situ methods. In order to understand the anharmonicity of carbonates, the high-pressure and high-temperature vibrational properties of all naturally occurring aragonite- …
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Chemistry and Transport of Metals from Entrenched Biosolids at a Reclaimed Mineral Sands Mining Site in Dinwiddie County, Virginia
… possess characteristics that uniquely affect metal solubility and mobility due to their influence on metal speciation. The objectives of this research were to compare the effects of biosolids stabilization type and rate on heavy metal solubility, mobility, and speciation. Two rates each of …
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Speciation of chromium in environmental matrices.
… results obtained illustrate the difficulties of speciation analysis in such complex matrices. A method based on single extraction with 0.43 mol L[-1] acetic acid followed by on-line ion chromatography with chemiluminescence detection was found to be simple, sensitive, free of interferences, and …
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A study of certain trace metals in sea water using anodic stripping voltammetry
… and applied for the direct analysis of the metals, Zn, Cu, Pb, and Cd in sea water. The electrode was observed to follow theoretical behavior for thin film electrodes and the technique was found not to be adversely affected by dissolved organic material in sea water. Good precision (ca., 5%) …
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Imaging and analysis of natural and manufactured nanoparticles
… with AFM. Additionally, a pilot study on metal speciation in SWCNTaq was conducted to determine partitioning of Ni, Y, Cd, Cu and Cr between particle-bound, labile and dissolved fractions with a view to better understand the role of SWCNTs in trace metals binding (and thus influencing …
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