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 9 of 9 for “"solid-liquid extraction"”.
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Métodos analíticos para la determinación de compuestos disruptores endocrinos
… hexa- congeners) in indoor dust by pressurized liquid extraction with in cell clean-up and gas chromatography - mass spectrometry M.P. Martínez, J.D. Carrillo and M.T. Tena, Analytical and Bioanalytical Chemistry 397 (2010) 257-267. 2. Focused ultrasound solid-liquid extraction and gas …
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Molecular composites of a conducting polymer: syntheses and characterization of poly(1,4-phenylenevinylene)-crown ether rotaxanes
… rotaxanes were isolated by dialysis and solid-liquid extraction. They were also characterized by TGA, IR, UV-vis, photoluminescence spectroscopy, and solid state ¹³C NMR from which the mass contents of the crown ethers were calculated. The conductivities of the PPV rotaxanes were measured …
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Trace element contaminants in the Kuwait water production system
… and cause major interference in the analysis. Solid-liquid extraction (chelex-100 resin) and liquid-liquid extraction (methyl iso-butyl ketone and freon) with and without back-extraction into nitric acid were investigated. Liquid-liquid extraction without back-extraction proved to give optimum …
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Novel Strategies using Micro Pressurized Liquid Extraction to Rapidly Prepare Solid Samples for Analysis
This thesis will describe several advancements in solid-liquid extraction methods using new applications of a micro preparative technique. The overall aim is to reduce solvent consumption and analysis times to promote quick, low solvent approaches to solid sample preparation. Additionally, this …
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Analytical methods for the determination of endocrine disruptors, UV filters and plastic additives in packaging and pharmaceuticals
… In each work, a focused ultrasonic solid-liquid extraction (FUSLE), a fast, simple and relatively new extraction technique, is developed and optimized; and its efficiency is evaluated by comparing it with other extraction techniques. Lastly, the developed methods are applied to the …
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Optimizing the Extraction of Phenolic Antioxidant Compounds from Peanut Skins
… properties. The effects of two types of extraction methods: solid-liquid extraction (SLE) and microwave-assisted extraction (MAE) on the recovery of phenolic compounds from peanut skins were investigated. Response surface methodology was used to optimize extraction conditions based on …
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Syntheses of Multi-headed, Two-tailed, Anionic Surfactants as Topical Microbicides
… By doing so, lactam impurity can be separated by solid-liquid extraction in hexane with sonication. The Behera's amine HCl salt was then separated and converted back into Behera's amine by Et3N in dry CH2Cl2. Dialkylacetic acid was converted into its sodium salt by using aqueous NaOH solution; the …
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Design and evaluation of a novel process for the recovery of Cu and Au from waste printed circuit boards
… and the novel ion-exchange extractant membrane solid-liquid extraction and electrowinning (IEM-SLE and EW) technique for Au concentration and recovery. The designed processing plant's early-stage technical feasibility assessment was supported by a laboratory experiment investigating the recovery …
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Quantification of pyrethroid and organophosphate metabolites in hair and urine samples of rural children from the Western Cape, South Africa using the two-dimensional gas chromatography-mass spectrometry
… method involved several key steps. First, the extraction techniques were optimized, utilizing QuEChERS for urine samples and solid-liquid extraction for hair samples. This was followed by the fine-tuning of metabolite derivatization using N-tert- butyldimethylsilyl-N-methyltrifluoroacetamide …