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Showing 1 to 19 of 19 for “"Speciation analysis"”.
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Speciation Analysis of Arsenic and Selenium by HPLC and Mass Spectrometry
… and a sample injection loop of 100 µ1. Total analysis time was under 7 minutes with limits of detection in the range of 2.0 - 10 µg kgˉ¹ for arsenic and selenium species, respectively. Work was undertaken, using HPLC-ICP-MS instrumentation, as part of a feasibility study, into the production …
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Slurry, Solution and Speciation Analysis By Inductively Coupled Plasma Atomic Emission Spectrometry
… has been investigated for solution, slurry and speciation analysis. It has been shown that it is possible to optimise a simultaneous multielement analysis for slurry and solution samples using solid state detection and optimisation algorithms. A range of certified reference materials have been …
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Trace Metal and Speciation Analysis using Ion-Exchange and Energy Dispersive X-ray Fluorescence Spectrometry
… their use as substrates in trace metal and speciation measurement by EDXRF. Structural information was obtained by scanning electron microscopy and x-ray microanalysis showing a homogeneous distribution of functional groups and retained ions on both sectioned and whole resins. Particle size …
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Investigations of and performance improvements in the mercury thiourea complex ion chromatography method for mercury speciation analysis
… ion chromatography (HgTU-IC) method for mercury speciation analysis, first developed at UIUC, was the subject of an in depth investigation aimed at i) understanding the causes of system performance problems, ii) optimizing its chemistry, and iii) coupling it to ICP-MS detection. The new system …
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A Systems Analysis of Trace Element Cycling in the Great Lakes
… on trace element budgets via geospatial and speciation analysis. Quantitative long-term mass-balances were constructed for a selection of important metals (Ni, Cu, Zn, Pb) and conservative elements (Na, Cl), the latter of which achieved >90% closure. Dynamic simulations and potential element …
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Elemental speciation and miniaturised sample introduction studies for inductively coupled plasma mass spectrometry
… aim is to develop methods for conducting rapid speciation analysis. This is approached in two ways; firstly using liquid chromatography (LC) employing a column with a monolithic silica stationary phase, and secondly by the development of a highly efficient sample introduction system designed for …
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Hyphenated techniques for speciation of Se in biological matrices
… analytical techniques to meet the needs of these speciation analysis. The species were first separated by using liquid chromatography, detection of the species was done by inductively coupled plasma mass spectrometry and electrospray ionization tandem mass spectrometry. The major species …
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Determination and speciation of mercury in sediment and related samples from Greece and Scotland
… adapted for screening marine samples, and the speciation and relationships of Hg with other sediment parameters in contaminated environments was examined. Field application of the colorimetric method indicated Hg concentrations in sediments from West Scotland, U.K., and Kifissos River, Greece, …
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Behavioural ecotoxicology of the brown shrimp, Crangon crangon : changing colour in polluted environments
… level of total As often detected in seafood, a speciation analysis was performed in the dosed specimens. The quantification of the various As species through time suggest the possibility of the brown shrimp to bio-transform inorganic arsenic (iAs) into the less toxic organic form [arsenobetaine …
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Speciation of chromium in environmental matrices.
… results obtained illustrate the difficulties of speciation analysis in such complex matrices. A method based on single extraction with 0.43 mol L[-1] acetic acid followed by on-line ion chromatography with chemiluminescence detection was found to be simple, sensitive, free of interferences, and …
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Selenium bioaccumulation and speciation in the benthic invertebrate Chironomus dilutus: an assessment of exposure pathways and bioavailability
… (< 5%) transferred to the exuvia. Selenium speciation analysis using X-ray absorption spectroscopy showed that increases in total selenium concentrations corresponded to increased fraction of organic selenides, modeled as selenomethionine, in C. dilutus larvae and adults. Results from the …
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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
… arsenic and selenium in these solutions. Speciation analysis was also carried out. The elution efficiencies using 1 M sodium hydroxide for arsenic and selenium were between 80--93% and the detection limit for arsenic and selenium for 3 day deployments based on the standard deviation of the …
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Systematics and evolutionary biology of the Weevils associated with cycads in Australia
… with multiple cycad species. Additionally, co-speciation analysis also shows no extensive co-speciation pattern in the Australian cycad-weevil pollination system. Compared with the distribution pattern, it suggests the speciation in allopatry may play a more dominant role in diversification of …
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Systematics and evolutionary biology of the Weevils associated with cycads in Australia
… with multiple cycad species. Additionally, co-speciation analysis also shows no extensive co-speciation pattern in the Australian cycad-weevil pollination system. Compared with the distribution pattern, it suggests the speciation in allopatry may play a more dominant role in diversification of …
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The Development of Analytical Procedures for Analysis of Trace Metals in Pharmaceutical Formulations and the Speciation of Arsenic in Antacids
… quantified were below the PDE (15µg/day), a speciation method using an ion-pair reversed phase high performance liquid chromatography (HPLC)-ICP-MS was optimised and validated according to ICH Q2B guidelines as no information regarding what species are present in such products is available in …
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REPRODUCTION IN FATHEAD MINNOWS (PIMEPHALES PROMELAS) FOLLOWING WATER OR SEDIMENT EXPOSURE TO A COMPLEX URANIUM MILLING EFFLUENT ELEVATED IN SELENIUM
… ovary, eggs and larvae). In addition, Se speciation analysis was conducted on selected fish tissues. Effects were overwhelmingly effluent-mediated with little contribution observed due to the presence of contaminated sediments. The contaminated sediments tested were taken from the actual …
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Wielopierwiastkowa analiza specjacyjna wody zaawansowaną techniką sprzężoną HPLC/ICP-DRC-MS
W prezentowanej rozprawie doktorskiej przedstawiono podsumowanie wyników badań prowadzonych w okresie od 2012 do 2016 roku, w ramach studium doktoranckiego. Wyniki zostały zaprezentowane w formie oryginalnych artykułów naukowych opublikowanych w czasopismach z listy filadelfijskiej. Prowadzone …
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Zastosowanie spektrometrii mas rozcieńczenia izotopowego w analizie specjacyjnej chromu w wodzie techniką sprzężoną HPLC/ICP-MS
Chrom jest pierwiastkiem wzbudzającym duże zainteresowanie w dziedzinie analizy specjacyjnej ze względu na przeciwstawne właściwości jego form chemicznych. Cr(III) uważany jest za niezbędny mikroskładnik odżywczy, gdyż warunkuje prawidłowe funkcjonowanie naszego organizmu, wspomagając metabolizm …