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 11 of 11 for “"Diffusive Gradients in Thin films"”.
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Diffusive gradients in thin films (DGT) as a technique to predict nutrient availability to plants
… extensive macro and micronutrient disorders varying greatly in their capacities to provide the chemical nutrients essential for plant growth. Assessment of nutrient availability in soils is important in order to maximise fertilizer efficiency and crop yields and to minimise environmental …
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Assessing the bioavailability of the radionuclides technetium-99, selenium-79 and uranium-238 in contaminated soils using the diffusive gradients in thin-films (DGT) technique
The increasing global inventory of 99Tc, 79Se and 238U as components of nuclear waste, coupled with the legacy of contaminated sites, means that increasing attention has been centred on understanding the environmental behaviour of these radionuclides. Over the last 15 years, the technique of …
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Effects of lake trophic state and seasonal cycling on production and bioaccumulation of methylmercury in Te Arawa Lakes
There are natural sources of Mercury in New Zealand, primarily derived from volcanic activity and geothermal vents. Mercury (Hg) and its organic derivative, methylmercury (MeHg), are highly toxic to both the environment and human health. Of particular concern is the ability of MeHg to bioaccumulate …
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From soil to groundwater: Assessing the leaching potential of cadmium across gradients of soil types and land-uses
… problem: The productivity of agriculture, the mainstay of New Zealand’ economy, relies on millions tons of fertiliser to maintain soil fertility. These fertilisers contain contaminants, including cadmium (Cd) which pose risks to the environment and human health. The assessment of the …
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Understanding of pesticides in waters and soils using a novel in situ dynamic sampling technique
There has been increasing concern about the widespread occurrence and persistence of pesticides in the environment. Pesticides can transport among and between environmental compartments, causing pollution in water, soil and air, and posing potential risks to humans and the ecosystem. There is a …
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Development of a rapid screening technique for contaminants in environmental monitoring and regulation
Rapid screening technique is important and efficient for routine monitoring of chemical pollutants, risk assessment and decision making in dealing with contaminants in waters and soils. The focus of this thesis is on developing simple and rapid screening methods based on the diffusive gradients in …
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Fate of emerging organic contaminants in Chinese wastewater treatment plants
There has been increasing concern about the widespread occurrence of emerging organic contaminants (EOCs) in the aquatic environment which could pose potential risks to humans and ecosystems. Wastewater treatment plants (WWTPs) are significant sources and major routes of EOCs entering the …
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Redox cycling of colloidal macro- and micro-nutrients in a monomictic lake
… just water bodies as they play an essential role in the cycling of nutrients and carbon, with impacts at the local and global scale. This study selected Lake Ngapouri, a small monomictic lake in the Waikiti Valley, Taupo Volcanic Zone, New Zealand, which receives a considerable amount of nutrients …
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Passive in-situ estrogenic potency sampling with DGT-YES
The purpose of this research was to investigate the presence of bisphenolic plastics and synthetic estrogens in municipal water systems, as well as along the Waikato River. The concentration of these compounds was assessed using a novel combination of methods that allowed the actual levels of …
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Phosphorus speciation, agronomic performance and soil nutrient testing for waste recovered fertiliser use in Northern Irish soil
… (P) runoff from agricultural land is causing P enrichment of surface waters, and is one of the main reasons why surficial water bodies in the United Kingdom (UK) are failing to meet Environmental Quality Standards (EQS) for fresh waters under the European Union (EU) Water Framework …
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Assessing water quality in Sultanate of Oman using a newly developed dynamic speciation technique
Rapid increases in coastal developments in the Sultanate of Oman recently, including large ports with industries, crude oil refineries, mining and industrial activities, have often produced point sources of metal and organic contaminations in the local marine systems. Although advances have been …