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Issue 7, 2016
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Chromium isotope ratio measurements in environmental matrices by MC-ICP-MS

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Abstract

An analytical procedure consisting of high pressure/temperature acid digestion using an UltraCLAVE system and a one pass, single column matrix separation using DOWEX AG 1X8 anion exchange resin was applied to the determination of Cr concentrations and δ53Cr in chromites, soils, and biological matrices (epiphytic lichens and mosses) using a combination of ICP-SFMS and MC-ICP-MS. The overall reproducibility of the method was assessed by replicate preparation and Cr isotope ratio measurements performed by different operators in multiple analytical sessions over a few months and was found to be 0.11‰ (2σ). The accuracy was evaluated using commercially available reference materials for which measured data were compared with certified values (for Cr concentrations) and previously published results (for isotope data). The results demonstrate a uniform Cr isotope composition in soil depth profiles sampled in different urban environments. A strong negative correlation between δ53Cr and Cr concentrations in lichens and mosses indicates that airborne Cr from local anthropogenic source(s) is depleted in heavy isotopes.

Graphical abstract: Chromium isotope ratio measurements in environmental matrices by MC-ICP-MS

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Article information


Submitted
19 Apr 2016
Accepted
09 May 2016
First published
09 May 2016

J. Anal. At. Spectrom., 2016,31, 1464-1471
Article type
Paper

Chromium isotope ratio measurements in environmental matrices by MC-ICP-MS

S. Pontér, N. Pallavicini, E. Engström, D. C. Baxter and I. Rodushkin, J. Anal. At. Spectrom., 2016, 31, 1464 DOI: 10.1039/C6JA00145A

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