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 54 for “"toxic metals"”.
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Characterization and remediation of toxic metals in wastewater reuse for agricultural irrigation
… food products. Common contaminants include toxic metals, which are conservative within the soil-plant-water system. While conventional treatment of these waste streams is possible the treatment is resource intensive leaving it beyond the reach of many developing nations. Inventory of metals …
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The effects of a toxic metals spill on aquatic fauna in streams near Culpeper, Virginia
… and industrial solvents, paint thinner's and metals were dumped there. The landfill is located on an unnamed tributary which also drains into Jonas Run. Aquatic insects and detritus were collected at all sampling sites. Crayfish and small fish were collected whenever possible. Various water …
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Assessment of co-occurrence of cyanotoxins, toxic metals and anionic surfactants in irrigation water, agricultural soils and food crops
… water for cyanotoxins, anionic surfactants and toxic metals, while 4 farmland sites were selected for agricultural soils and food crops in Roodeplaat and Hartbeespoort sites. Physicochemical parameters of the irrigation water (pH, temperature, EC, TDS, DO), chlorophyll-a and dissolved nutrients …
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Empirical investigation of water pollution control through use of Phragmites australis
… a problem of water pollution caused by heavy and toxic metals Cd, Cr, Cu and Pb. The thesis proposes the use of the technique of phytoremediation using Phragmites australis (PA) plants that have the capacity to absorb and to accumulate such metals in their roots and leaves. The metal uptake and …
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Sorption and release of dissolved pollutants via bioretention media.
… as a treatment technique for the removal of toxic metals and investigates the release of phosphorus. A review of previous research and the laboratory experiments will be discussed in two chapters. Chapter 1 reviews the literature on the concentrations, sources, and effects of toxic metals …
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USE OF MICROALGAE FOR WASTEWATER TREATMENT AND BIOFUEL PRODUCTION: EFFECTS OF ENVIRONMENTAL CONTAMINANTS ON THE CELLULAR RESPONSE
… triacylglycerols. However, the presence of toxic contaminants in municipal or industrial wastewater could negatively affect the biomass growth and modify the pattern of lipid accumulation in algae cells. This research aims to evaluate the potential of cultivating microalgae in wastewater for …
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The Removal and Recovery of Oxo-Anions from Aqueous Systems using Nano-Porous Silica Polyamine Composites
… discharges containing high concentrations of toxic metals is omnipresent in the environment. Heavy metal ions from manufacturing sources can compromise the integrity of various ecological cycles as well as negatively impacting the health of humans through drinking water and the food chain. …
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The Removal and Recovery of Oxo-Anions from Aqueous Systems using Nano-Porous Silica Polyamine Composites
… discharges containing high concentrations of toxic metals is omnipresent in the environment. Heavy metal ions from manufacturing sources can compromise the integrity of various ecological cycles as well as negatively impacting the health of humans through drinking water and the food chain. …
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Complex Formation of Pb(II) with Cysteine, Penicillamine and N-acetylcysteine
… of lead poisoning and interest in metal toxicity has been a growing area of study since the late 1950s. In order to gain insight on how toxic metals behave physiologically, simple molecules can first be used to model the environments. Complex formation between Pb(II) and thiol-containing …
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Identification, localization and metal-catalyzed induction of specific metallothionein isoforms expressed by the adult human lens
… protective pathways, including binding of toxic metals and oxidative stress. Previously we detected increased expression of MT IIA in age-related human cataractous lenses. As a first step towards defining the function of MTs in the lens, we sought to establish the expression patterns of …
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Toxic Metal Concentration and Distribution in Soils of Four Abandoned Landfill Sites, Springfield, Missouri
… and surface water contamination by leachate. Toxic metals are present in the landfills from the disposal of everyday household items, and the two more recently abandoned Springfield landfills were the recipients of waste from a metal plating industry in the city. The landfill soils were tested …
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Characterization of volcanic ash from 2010 Mt Merapi, Indonesia eruption by neutron activation analysis and leaching analysis
… material present in the ash. Several potentially toxic metals and metalloids leached out of the system at relatively high rates. For example, 2.7% of the original antimony present in the ash leached into the simulated rainwater, as well as 1.7% of the original nickel, and 0.71% of the original …
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THE FABRICATION AND STUDY OF METAL CHELATING STATIONARY PHASES FOR THE HIGH PERFORMANCE SEPARATION OF METAL IONS
… for the high efficiency separation of trace metals in complex samples, using a single column and isocratic elution, is described. Hydrophobic, neutral polystyrene divinylbenzene resins were either impregnated with chelating dyes or dynamically modified with heterocyclic organic acids, using …
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The development of a strategic approach to managing diffuse pollution
… solids, nutrients, faecal indicator organisms, toxic metals and organic pollutants. Key characterisation aspects included the investigation of how concentration (not just load) varies with flow in diffuse pollution impacted watercourses. It was repeatedly found that higher concentrations …
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The dietary mineral content of Claytonia lanceolata corms from multiple populations across the Columbia Plateau region of North America
… Corms were assayed for dietary mineral and toxic metal content using standard ICP-OES methods. We found that a single serving of corms (100 g fresh weight) likely provided between 10-25% of the DRI for Mg, P, Cu, and Zn, and over 100% of the DRI for Fe and Mn. These values compare favorably …
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Prevalence, persistence and consequences of microorganisms within oil field environments and mitigation strategies
… salinities, high pressures and the presence of toxic metals). Furthermore, these “extremophiles” can significantly impact oil production operations both negatively (i.e., reservoir souring) and positively (i.e., reservoir souring control). To date, most microbiology studies of hydraulically …
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Integrated electronic waste management in Mexico : law, technology and public policy
… but because of the hazardous materials and toxic metals, including lead, nickel, cadmium, mercury and chromium to mention some of the most important health wise and the gold, copper, aluminum, nickel, silver and palladium they contain. These contents also offer incentives for their …
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Development of an acid mine drainage treatment technology and recovery of minerals
… impacts due to low pH, high concentrations of toxic metals which can pollute freshwater sources. There is need for development of a technology which treats and recover beneficial minerals from AMD. Samples of AMD, water, sediments from the field and sludge from neutralization batch experiments …
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