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Evaluation of simultaneous analyte leaching/vapour phase introduction for direct os isotope ratio measurements in solid samples by double focusing sector field ICP-MS
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-4505-4590
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.
2007 (engelsk)Inngår i: Geostandards and Geoanalytical Research, ISSN 1639-4488, E-ISSN 1751-908X, Vol. 31, nr 1, s. 27-38Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The analytical performance of a hyphenated method for Os isotope ratio measurements by double focusing, sector field ICP-MS (ICP-SFMS) was evaluated. The method is based on several optimised, concurrent processes: Os extraction from samples in hot concentrated nitric acid; separation of Os from the digest solution by formation of volatile osmium tetroxide accelerated by continuous hydrogen peroxide addition; transport of analyte vapour by an oxygen flow into the ICP; and isotopic analysis by ICP-SFMS. Due to the very efficient analyte utilisation (in excess of 0.5‰), isotope ratio measurement can be performed at low pg Os levels. Combined with the ability to process sample sizes up to 2 g (up to 50 g if the organic matrix of biological or botanical samples is eliminated by ashing), materials with Os concentrations in the low, or even sub-pg g-1 range can be analysed by the method. Given that two complete digestion/distillation systems are available for interchangeable use, throughputs of up to 15 samples per 8-hour shift can be achieved. The method precision, evaluated as the long-term reproducibility of 187Os/188Os ratio measurements in a commercial Os standard containing 0.5 ng Os, was 0.16% relative standard deviation (RSD, 1 s). The method has been applied to perform replicate 187Os/188Os ratio measurements in a suite of 50 reference materials of various origins and matrix compositions, with Os concentrations varying from <0.1 pg g-1 to >100 ng g-1, yielding an average precision of 3% RSD. Though none of the materials tested are certified for Os content or Os isotope composition, comparison of the obtained data with published Os isotope information for similar sample types revealed close agreement between the two. The method can also be used for the simultaneous, semi-quantitative approximation of Os concentrations.

sted, utgiver, år, opplag, sider
2007. Vol. 31, nr 1, s. 27-38
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Tillämpad geologi
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URN: urn:nbn:se:ltu:diva-10737DOI: 10.1111/j.1751-908X.2007.00835.xISI: 000246235000004Scopus ID: 2-s2.0-33947674195Lokal ID: 994b0310-7591-11dc-824d-000ea68e967bOAI: oai:DiVA.org:ltu-10737DiVA, id: diva2:983684
Merknad
Validerad; 2007; 20071008 (emmeng)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Rodushkin, IlyaEngström, EmmaBaxter, Douglas

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