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 25 for “"DGT"”.
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Passive in-situ estrogenic potency sampling with DGT-YES
… was based on diffusive gradients in thin films (DGTs) coupled with high-performance liquid chromatography/mass spectrometry analysis (HPLC/MS) and the Yeast Estrogen Screen (YES). DGT estimated time-integrated concentrations while HPLC/MS ensured a robust, automated and sensitive routine …
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Diffusive gradients in thin films (DGT) as a technique to predict nutrient availability to plants
… new method, Diffusive Gradients in Thin Films ( DGT ), provides the potential to become an alternative soil test that could accurately predict nutrient availability. To date, DGT technology has only been designed for separate assessment of anionic and cationic species in waters or soils typically …
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Fate of emerging organic contaminants in Chinese wastewater treatment plants
… technique of diffusive gradients in thin-films (DGT) for in situ measurement of selected EOCs in water was developed in the laboratory and validated under the real world condition-a WWTP. This sampler was then employed to study the occurrence and removal efficiencies of EOCs in Chinese WWTPs, as …
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Development of a rapid screening technique for contaminants in environmental monitoring and regulation
… based on the diffusive gradients in thin films (DGT) technique to assess the concentration of phosphorus and metals qualitatively and quantitatively. Firstly, a rapid detection technique for phosphorus based on Metsorb DGT devices and a colour imaging method using the conventional molybdenum blue …
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Understanding of pesticides in waters and soils using a novel in situ dynamic sampling technique
… technique of diffusive gradients in thin-films (DGT) was developed and validated for pesticides in water and soils for the first time. The DGT technique was developed for in situ measurement of 9 pesticides in water. The compounds were carefully selected to represent a wide range of properties …
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Assessing water quality in Sultanate of Oman using a newly developed dynamic speciation technique
… in aquatic system using a dynamic technique DGT (Diffusive Gradients in Thin-films) or using other equilibrium techniques, measuring metal speciation in situ in seawater that polluted by crude oil is still extremely challenging. Without the technology and the information, it is difficult to …
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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
… technique of diffusive gradients in thin-films (DGT) has emerged as a promising tool for assessing bioavailability based on its demonstrated ability to successfully predict plant uptake for a range of metals and metalloids in soil (Zhang and Davison, 2015). It is therefore utilised in this thesis …
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From soil to groundwater: Assessing the leaching potential of cadmium across gradients of soil types and land-uses
… of interest. Diffusive gradients in thin films (DGT) is an established in-situ technique that can provide information on the concentrations and bioavailability of diverse contaminants in soil, sediment and groundwater. The DGT method has rarely been applied to relatively slowly moving groundwater …
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Application of diffusive gradient in thin-film passive samplers to assess mercury availability and mobility in a fresh water river system
… porewater is Diffusive Gradient in Thin-Films (DGT) samplers; a technique that has been employed since the 1990’s but is relatively new for mercury and has been primarily utilized in the laboratory. The approach estimates porewater concentrations of mercury species in-situ based upon the rate at …
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Développement des sondes DGT spécifiques à l'échantillonnage in situ du radium à base des gels récepteurs de TK100, d'AG50W-X8, de CHELEX-100 et des oxydes de manganèse
… de maitrise qui vise à développer des sondes DGT (Diffusive Gradient in Thin film) spécifiques au radium. Cet outil analytique, adapté aux conditions de terrain, permet d'étudier la spéciation et la biodisponibilité des contaminants métalliques.
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The Fate and Effects of Contaminants in Estuarine Environments
… use of diffuse gradient ‘in thin films’ (DGT) and the analysis of δ15N-NO3 and δ18O-NO3 in water, are new for New Zealand estuarine systems; the correlations generated will enhance baseline datasets for future environmental studies. This research additionally led to the development of a …
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Evaluation of Arsenic and Selenium Quantitation in Marcellus Shales and Flowback Saline Waters using Thiol Cotton Fibre-Graphite Furnace Atomic Absorption Spectroscopy and Diffusive Gradient in Thin Film Techniques
… a Diffusive Gradients in Thin Film technique (DGT) employing a polyacrylamide diffusive gel or 3-mecarptopropyl-functionalized silica and high-capacity nanocrystalline titanium (IV) oxide adsorbent (Metsorb) has been modified and used to isolate the bioavailable analytes species and thereby …
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GAMMA-RAY IMAGING OBSERVATIONS OF THE CRAB AND CYGNUS REGIONS
… to as the Directional Gamma-Ray Telescope (DGT), which is designed to image celestial gamma-rays over the energy range 160 keV to 9.3 MeV. It utilizes a technique known as coded aperture imaging in order to obtain spatially resolved images of the sky with an angular resolution of …
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Redox cycling of colloidal macro- and micro-nutrients in a monomictic lake
… by diffusive gradients in thin films (DGT). Colloids from the lake were additionally analyzed using transmission electron microscopy (TEM), atomic force microscopy (AFM), fluorescence spectroscopy, and a suite of complementary methods. Results show considerable changes in the …
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Investigating adsorption characteristics of Delonix regia for heavy metals removal in wastewater and its potential for remediating contaminated soils
… resupply using Diffusive Gradient in Thin film (DGT) technique and DGT- Induced Fluxes in Sediments (DIFS) model. Batch adsorption experiments were carried out using the adsorbent prepared from the pods and leaves of Delonix regia in order to determine the suitable operating parameters for the …
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Phosphorus speciation, agronomic performance and soil nutrient testing for waste recovered fertiliser use in Northern Irish soil
… alternative advanced speciation method, namely DGT (Diffusive Gradients in Thin films), could be used instead to assess P bioavailability in these and other soil types in NI. The method has been successfully used on a range of soils in England and Scotland, but has not yet been trialled in NI. …
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Small-scale heterogeneity in sediments : experimental and modelling investigations
… iron and manganese in a marine sediment using DGT, although this is not directly related to microniches, these data are useful in modelling the release of microniche trace metal from authigenic oxides; 4) the development and application of a three-dimensional diagenetic model to investigate …
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Effects of lake trophic state and seasonal cycling on production and bioaccumulation of methylmercury in Te Arawa Lakes
… using diffusive gradients in thin films (DGT) samplers, while tissue analyses determined Hg, MeHg and additional trace elements in the selected species. The findings of this study are expected to clarify the distribution and bioaccumulation of Hg and MeHg within lake ecosystems and to …
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LITERATURE REVIEW: The Use of Cation-Exchange Resins in Natural Water Trace Metals Research. ARTICLE: Determination of Free Ion Trace Metal Concentrations in Freshwaters Using Cation-Exchange Resin Equilibrium. A Preliminary Investigation.
… minimising the eluent volume. The development of DGT speciation studies may bring about a technique that is less complex but easier to undertake and yields simple yet useful complexation data. The potential for IDA-resins to yield free-ion concentrations based on equilibrium-based sorption is a …
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Analisis kepatuhan wajib pajak sebelum dan sesudah diterapkannya Peraturan Pemerintah No. 46 Tahun 2013 di UMKM ONYK Tulungagung
… made by the Directorate General of Taxation (DGT) is imposing Government Regulation No. 46 Year 2013, the tax base used is gross income every month with final income tax rate of 1%. The emergence of these regulations is to provide convenience for taxpayers in determining the amount of income …
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