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 121 for “"Aquatic environment"”.
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Pesticides in the Aquatic Environment
… are ubiquitous contaminants of the freshwater aquatic environment. Pesticide residues are found in varying amounts in all components of the aquatic ecosystem including water, animal and plant tissue and sediments. Organochlorine pesticide residues in water, usually in the parts per trillion …
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Abiotic pathways of mercury methylation in the aquatic environment
… 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 various experimental conditions, relevant to environmental situations. The amount of …
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The fate of fluorescent whitening agents in the aquatic environment
The commercial use of fluorescent whitening agents (FWA' s) in products such as soaps and detergents has resulted in the presence of these compounds in domestic waste waters.<br/><br/>A model compound (A) (a possible initial degradation product of a stilbene-s-triazine type FWA) was synthesised and …
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Combined effects of bioavailable organic contaminants in the aquatic environment.
… complex mixtures of organic contaminants in the aquatic environment. SR-PSDs were deployed for seven to nine weeks in water at various locations within the Ythan catchment (north-east of Scotland), and within the Forth estuary and the Firth of Forth (east coast of central Scotland). Following …
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Reactions of graphene oxide and buckminsterfullerene in the aquatic environment
… will inevitably find their way to the natural environment. However, their environmental fate and transport have not been intensively explored, resulting in a general lack of knowledge regarding their risk assessment and life cycle exposure concentrations. To this end, this study has …
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Improved Detection Methods for Selected Vibrio Species in the Marine Aquatic Environment
… here allows enumeration of the bacteria from environmental waters in total, and when coupled with other methods, allows enumeration of the VBNC portion of the population. The work presented in this thesis serves to further characterize these bacteria and presents novel methods for their …
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Mechanisms of Microbial Formation and Photodegradation of Methylmercury in the Aquatic Environment
… through consumption of contaminated aquatic fish. To date, effective strategies for preventing and remediating methylmercury contamination have remained elusive, mainly due to the lack of knowledge in regard to how methylmercury is generated and degraded in the aquatic environment. …
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A comparison of techniques for estimating the hazard of chemicals in the aquatic environment
… of cadmium constituting a threat to aquatic ecosystems were derived from laboratory tests conducted at two levels of the biological hierarchy. A population level estimate was derived from single species toxicity tests and a community level estimate was derived from laboratory tests on …
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Photochemistry of single-walled carbon nanotubes in the aquatic environment, and their extraction from soils
… indicates that CNTs will find their way into the environment, which will result in certain environmental exposure. Yet, there have not been sufficient and definitive studies on the health and environment effects of CNTs. For example, additional information regarding environmental transformation …
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Development of Alternative Methods to Assess the Toxicity and Bioaccumulation Potential of Chemicals in the Aquatic Environment
… in risk assessment. In the context of the aquatic environment, both properties were traditionally evaluated in the whole fish. However, due to the reluctance to use a large number of animals for experimentation and high cost of in vivo testing, alternative techniques have been developed to …
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Investigating the occurrence and fate of anticancer drugs in sewage treatment works and the wider aquatic environment
… of pharmaceuticals in wastewater and the wider environment is of growing concern. This thesis focuses on anticancer drugs - a group of biologicallypotent and often recalcitrant set of chemicals whose fate and impact on the wider freshwater environment is poorly studied. The aims of this thesis …
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Genomics-Based Characterization of the Microbial Community and Plasmidome of the Regina Wastewater Treatment Facility and the Surrounding Aquatic Environment
… wastewater treatment prior to discharge into the environment. Most large-scale wastewater treatment plants (WWTPs) remove contaminants from wastewater using the activated sludge process, wherein wastewater is mixed with a flocculent slurry of microorganisms that use these contaminants for the …
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Assessing the influence of low head weirs and low head ‘on weir’ hydropower on the phytobenthic biofilm
… interests, current understandings of the aquatic implications of low head ‘on weir’ hydro are unclear and not one in field investigation has been carried out at an existing scheme. Yet with important environmental legislation preventing the deterioration of ecological river quality, mainly …
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Antimicrobial resistance gene monitoring in aquatic environments
This dissertation documents the development of an environmental framework for monitoring antimicrobial resistance gene (ARG) dissemination in the aquatic environment. The work opens with a review of the relevant literature and outlines the importance of an environmental framework for monitoring ARG …
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Investigations on the Phenomena of Accumulation and Mobilization of Heavy Metals and Arsenic at the Sediment-Water Interface by Electrochemically Initiated Processes
… and municipal effluents are discharged. Aquatic sediments/environments are often polluted by heavy metals due to the temporal variations in anthropogenic input of contaminants via atmospheric deposition, catchment runoff, effluent inflow and dumping from industrial transportation, mining, …
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Polyethylene devices and the effects of sediment resuspension on the cycling of PAHs and PCBs in the lower Hudson Estuary
… device (PED), for measuring HOCs in the aquatic environment was developed; 2) the desorption rate of pyrene, a polycyclic aromatic hydrocarbon (PAH), from native Hudson River sediments was measured, and 3) pyrene and 2,2',5,5'-tetrachlorobiphenyl (PCB #52), a polychlorinated biphenyl …
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Improving the risk assessment of short-term stormwater and effluent discharges to aquatic environments
… with differing concentration-profiles to the aquatic environment, unintentionally (e.g., stormwater overflow) or intentionally (e.g., licensed industrial discharges). In the dynamic aquatic environment chemical concentrations can fluctuate, resulting in short-term exposures of organisms. …
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A study of the distribution of selected anthropogenic micropollutants in the seawater of Dublin bay
… growing awareness of the existence of widespread environmental pollution and of the potentially harmful effects that polluting species can have on biological systems. Initially the concern focused on the ubiquity and on the harmful effects of organochlorine compounds, in particular organochlorine …
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