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Showing 1 to 14 of 14 for “"Microwave digestion"”.
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The microwave digestion of solids
Microwave ovens have been available for domestic cooking since 1956. This method of heating is very efficient compared to conventional cooking methods. As a result many applications have arisen particularly in the field of analytical chemistry. Most routine analysis of biological and chemical …
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Microwave digestion methods for preparation of platinum ore samples for Icp analysis
The technique of microwave digestion was evaluated as a possible alternative to conventional sample preparation methods for the platinum ores prior to spectroscopic analysis. Microwave energy used with aqua regia in closed vessel provides elevated pressure and rapid heating which significantly …
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Gradient ion chromatographic determination of rare earth elements in coal and fly ash
… dissolved in sealed pressure vessels in a microwave oven. Standard ashing procedures, followed by acid dissolution, were carried out to allow comparison with the microwave digestion technique. A lithium metaborate/tetraborate fusion and acid dissolution technique was used for the …
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An investigation into the fluorination capabilities of ammonium acid fluoride under microwave radiation with respect to zircon
… of this study was to investigate the use of microwave digestion as an alternative process, and to determine the parameters for this technique for the digestion of zircon with ammonium acid fluoride (AAF) under various conditions. Ammonium acid fluoride is more convenient and safer to use than …
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Mercury in hair: Method development and application to population studies.
… in the UK.The development and optimisation of a digestion procedure for the determination of total mercury in hair is described. The procedure chosen consists of the microwave digestion of 0.2-0.5g hair with 2 ml HNO3 and 1 ml H2O2 . The effect of washing and drying of the samples is …
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The determination of mercury and its organo compounds by high performance liquid chromatography-atomic flourescence spectrometry.
A number of digestion procedures used for the preparation of soil and sediments samples for the determination of total mercury by cold vapour atomic fluorescence spectrometry were investigated. Satisfactory results were obtained from a closed microwave digestion procedure for which 0.5g of soil or …
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Determination of trace elements in crude oils by ICP-MS using detergent microemulsion.
… sample preparation protocols (dry ash, wet digestion and microwave digestion) and good agreement was obtained between the results using the proposed and comparative procedures. The accuracy was confirmed by analysing two different certified reference materials (Used Oil HU-1 from SCP science …
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Chemical Elemental Composition from Vineyard Soil to Wine in Hawke’s Bay and Marlborough, New Zealand
… of grapevine bark was optimised and validated. A digestion method of HNO₃ (1.5 mL), H₂O₂ (1.5 mL), and HCl (4.5 mL) with 15 minutes of microwave digestion proved to be the optimal conditions for ICP-MS sample preparation. The elemental composition, as determined by ICP-MS of soil, bark, leaves, …
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The development of methods for the determination of selenium using spectrofluorimetric and ICP-MS techniques.
… total selenium in nutritional supplements after microwave digestion and photoreduction of Se (VI) to Se (IV). The analytical precision in the concentration range 0. 5 - 1000 mug ml[-1] was better than 5%. Excellent agreement (r[2] = 0.9960) between the results of the fluorimetric and ICP-MS …
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UNCERTAINTY CONTRIBUTIONS TO SPECIES SPECIFIC ISOTOPE DILUTION ANALYSIS
… when concentrated HNO3 in combination with a microwave digestion was employed. For DORM-2, complete equilibration was achieved when using 1:1 H2O.CH3OH v\v and 0.01 % 2-mercaptoethanol as the solvent, even though only 47% of the analyte was extracted into the liquid phase. The mass fraction of …
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Arsenic in the Pak Pa-Nang River Basin, Thailand
… 1 M H3P04 extraction in an open focused microwave system. An anion-exchange HPLC system employing a step elution, with sulphate and phosphate solution as the mobile phase coupled with ICP-MS was used for separation and detection of the important arsenic species, e.g. AsB, DMA, MMA, and …
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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
… to analyze Marcellus shale samples following microwave digestion as well as spiked samples of high salinity water (HSW) and flowback wastewater (WRF6) obtained from an actual gas well drilling operation. Quantitation of arsenic and selenium was carried out by graphite furnace atomic …
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Metal exposure in non-occupationally exposed pregnant women of Western Australia and contribution of environmental sources
… this study included the optimisation of the microwave digestion method for measuring a broad range of elements simultaneously in human blood using ICP-MS. In this study, most women recorded low concentrations of metals in blood and urine. Metals were detected in most samples with the …
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Antimony and acetaldehyde migration from Nigerian and British PET bottles into water and soft drinks under typical use conditions. Concentration of migrants and some trace elements in polyethylene terephthalate and in bottled contents.
… of PET and other plastics was determined by microwave digestion and ICP-MS. Acetaldehyde content of water and soft drinks and PET were determined using headspace gas chromatography with flame ionisation detection (GC-FID). Accuracy and precision for determination of antimony and other trace …