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 44 for “"ecotoxicity"”.
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Ecotoxicity of silver nanoparticles on estuarine and coastal bacterial communities
The increasing use of silver nanoparticles (AgNPs) as a biocidal agent and their potential accumulation in coastal environments may threaten non-target natural environmental bacterial communities. For this reason the main aim of this PhD project was to examine the effects of AgNPs on the …
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Evaluation of Colloidal Stability and Ecotoxicity of Metal-based Nanoparticles in the Aquatic and Terrestrial Systems
<p>Intrinsic to the many nano-enabled products are atomic-size multifunctional engineered nanomaterials, which upon release contaminate the environments, raising considerable health and safety concerns. This Ph.D. dissertation is designed to investigate (i) whether metals or oxide nanoparticles are …
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Assessment of the potential environmental impacts arising from mercury-free dental restorative materials
… gaps regarding the particle load and potential ecotoxicity of the particulate matter resulting from Hg-free materials exist. Moreover, the widely known environmental and human health impacts of Hg contained in dental amalgam have led to the widespread introduction of an amalgam capture device, …
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Hydrologic-Based Ecological Risk Assessment of Urban, Agriculture, and Coal Mining Impacts Upon Aquatic Habitat, Toxicity, and Biodiversity
… sediment, and water column chemistry to aquatic ecotoxicity through examination of the origin and fate of sulfate, magnesium, iron, manganese, and zinc. Key findings in risk assessment of Leading Creek indicated that (1) abandoned near-surface underground mine lands (AUML) were associated with …
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Improving the risk assessment of short-term stormwater and effluent discharges to aquatic environments
… in short-term exposures of organisms. Current ecotoxicity methods may be unsuitable to assess the risk of short-term contaminant exposures. This is because there is evidence to suggest that aquatic organisms can tolerate higher concentrations of some contaminants when exposed for a shorter …
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Characterization of Arsenic by High Performance Liquid Chromatography and Inductively Coupled Plasma Mass Spectrometry of Algal Extracts and Water in Evaporation Ponds
… so, these detoxifying algae may have important ecotoxicity and environmental health implications.
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Environmental risk assessment and human pharmaceuticals: limitations and future improvements
… makers. Interviewees felt that the current ecotoxicity tests would benefit from a more intelligent approach incorporating the mode of action of the drug. The bioinformatics results show that protein drug targets are highly conserved in some aquatic organisms but not others. The molecular …
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Life Cycle Environmental Impacts and Decarbonisation Pathways of China’s Urban Water Systems
… contributor to climate change, freshwater ecotoxicity, freshwater eutrophication, human non-carcinogenic toxicity, terrestrial acidification, terrestrial ecotoxicity impacts among all UWS stages. Purchased electricity is the main driver of climate change, terrestrial acidification, fossil …
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Life cycle assessment case study of North American residential windows
… municipal landfills which reduced the aquatic ecotoxicity of the wood window's life cycle. Other potential improvements to the impacts of the three windows' life cycles include improving energy efficiency, particularly during secondary manufacturing.
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AMPHOTERIC POLYAMIDOAMINES AS FUNCTIONAL SPECIALTY POLYMERS
… during or after their useful life. The ecotoxicity of PAAs was evaluated on the early stages of plant development using Lepidium sativum (watercress) seeds. In this study, the effectiveness and robustness of the seed germination test for assessing the phytotoxicity of water-soluble …
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Investigation of alternative fuels for various applications: experimental and life cycle assessment studies
… potential, and human toxicity potential. Marine ecotoxicity potential showed variability, with butanol and synthetic gas demonstrating poor performance, while methane and soy biodiesel presented better-balanced profiles. This thesis study offers vital insights for clean energy transitions, …
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Integrative Bioassessment of Acid Mine Drainage Impacts on the Upper Powell River Watershed, Southwestern Virginia
… conducted to investigate the nature of AMD ecotoxicity in the upper Powell River watershed. Emphasis was placed upon bioassessment methodologies and AMD impacts beyond the zone of pH depression. Major findings and processes developed included: 1) an Ecotoxicological Rating (ETR) system was …
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LIQUID PLASTICS AS A NEW ENVIRONMENTAL PROBLEM? AN INTEGRATED RISK ASSESSMENT OF POLYVINYL ALCOHOL, POLYETHYLENE GLYCOL, POLYVINYL PYRROLIDONE AND POLYACRYLIC ACID
… ecosystems. This study aimed to evaluate the ecotoxicity of four commonly used WSPs—polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), and polyacrylic acid (PAA)—using the freshwater fish Danio rerio and the crustacean Daphnia magna as model organisms. The impacts …
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Development of an analytical method to derive hydrophobicity parameters for use as descriptors for the prediction of the environmental and human health risk of chemicals
… endpoints, using published skin absorption and ecotoxicity data respectively.
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Indices de eficiencia ambiental en el sector público hospitalario
… to increased human toxicity and aquatic ecotoxicity. This underscores the imperative of conducting a comprehensive life cycle assessment when evaluating seemingly “green” solutions. In conclusion, this research provides valuable tools for evidence-based decision-making within healthcare …
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Life cycle assessment of the production of xanthate salts and of their application for ARD mitigation
… acidification, human toxicity, freshwater ecotoxicity and fossil depletion, ReCiPe, a midpoint life cycle impact assessment (LCIA) method was chosen. Study results confirmed that the new carbon disulphide production facility has a significantly lower environmental foot print than the old …
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The Environmental Fate and transport of Trenbolone Acetate Metabolites in Agro-Ecosystems
… (>10 ng/L) reach receiving waters. While the ecotoxicity of TBA metabolites, including 17alpha-trenbolone (17a-TBOH), 17a-trenbolone, and trendione, have been reasonably well characterized, their fate and transport in the environment is poorly characterized. Therefore, lab, plot, and field …
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Quantification, phase distribution, and persistence of antiretroviral drugs in wastewater treatment systems and their ecotoxicological impacts in aquatic environments
… below the detection threshold of standard ecotoxicity assays. These effects were observed at concentrations comparable to those measured in South African surface waters, while conventional mortality and morphological endpoints did not indicate any effects at these levels. The combined …
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FACTORS CONTROLLING NICKEL BIOAVAILABILITY AND EFFECTS ON BENTHIC INVERTEBRATES IN HARDWATER FRESHWATER STREAMS
… are fewer studies and data available for the ecotoxicity of Ni, and these studies help discern Ni bioavailability on a range of aquatic organisms and benthic macroinvertebrate communities. This research has better elucidated the toxicity of Ni in freshwater ecosystems, demonstrating the …
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QUALITATIVE AND QUANTITATIVE PROCEDURE FOR UNCERTAINTY ANALYSIS IN LIFE CYCLE ASSESSMENT OF WASTEWATER SOLIDS TREATMENT PROCESSES
… climate change, radiation, ozone depletion, ecotoxicity, acidification-eutrophication, and minerals and fossil fuels depletion. Analysis of the existing scenario shows that most of the impacts came from the operation phase on the categories related to fossil fuels depletion, respiratory …
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