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 10 of 10 for “"Single extraction"”.
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Generalized entanglement in quantum information theory : optimization free measures and faithful extraction protocols
… projective quantum measurement. The question of extraction of quantum coherence from one system to another in a faithful way is also studied. We construct two novel protocols, one able to extract only a small amount of coherence each time and the other a larger amount and apply these to a …
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POLYMERIC MEMBRANE DEVICES AND AUTOMATION - DESIGNS FOR INNOVATIVE STUDY IN MICROSCALE ANALYTICAL TECHNIQUES FOR ENVIRONMENTAL ANALYSIS
… under study comprise of electromembrane extraction (EME), in-syringe dynamic liquid-phase microextraction (LPME) and two-phase LPME. The main focus of this work was to design polymeric membrane devices suitable for convenient sample pretreatment and to incorporate automation into the …
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Studies of arsenic, copper and lead in the soils of the Tamar Valley
… combination of sodium dithionite and nitric acid extraction techniques, from which elemental association with secondary iron and sulphide minerals may be determined. Enhanced levels resulting from aerial pollution were found in a zone a few hundred metres around mine sites. This work has …
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The spatial distribution of total and available heavy metals at areas of historic mining activity in the Peak District and their influence on local vegetation communities
The Peak District in the UK has seen metal ore extraction and other mining activities take place for hundreds of years. As a result, many areas contain elevated soil concentrations of several heavy metals, which can be toxic to many plant species. However, these conditions have favoured several …
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Promotion of Value-Added Uses of Soybeans
… classes of soy lipophilic phytochemicals, in a single extraction and HPLC run. A ternary, isocratic solvent system of acetonitrile, methanol and water (48:22.5:29.5, v/v/v) was used to achieve separation on a phenyl column. Evaporative light scattering detection (ELSD) was used to quantify …
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Development of a low volume dispersive liquid-liquid microextraction method for the simultaneous determination of illicit psychoactive drugs used by motorists in the Khomas region of Namibia
… A rapid low volume dispersive liquid-liquid microextraction (DLLME) method in combination with gas chromatography-mass spectrometry (GC-MS) detection was developed for the simultaneous determination of illicit psychoactive drugs in blood (those used most commonly in Namibia: cocaine, Δ⁹- …
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Speciation of chromium in environmental matrices.
Published methods for single and sequential extraction, separation and determination of chromium(III) and (VI) in sewage sludge, soil and dried plant material were critically evaluated. The results obtained illustrate the difficulties of speciation analysis in such complex matrices. A method based …
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Evaluating Leachability of Residual Solids Generated from Unconventional Shale Gas Production Operations in Marcellus Shale
… mud (DM). The samples were subjected to both single extraction (i.e. Shake Extraction Test, SET) and multiple extraction (i.e. Immersion Test, IT) leaching tests. For the shake extraction test, samples were mixed with a specific amount of leaching solution without renewal over a short time …
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Advancing Lithium Extraction from Nevada’s Sedimentary Claystones: Hydrometallurgical Pathways and Sustainability Perspectives
… complex mixed mineralogy, renders conventional extraction approaches technically inefficient. This dissertation presents a systematic four-study experimental investigation of lithium extraction from Nevada sedimentary claystones, advancing mechanistic understanding of mineral–reagent …