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Issue 15, 2014
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A method for determination of PGE–Re concentrations and Os isotopic compositions in environmental materials

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Abstract

Automobile catalyst emissions not only result in increasing environmental concentrations of Pt, Pd, and Rh, but also Os, Ir, and Ru. Little is known about the behavior of platinum-group elements (PGE) and Re in the environment and their potential risk to humans and, as such, the monitoring of Os, Ir, Ru, and Re concentrations in environmental samples is necessary. We present an improved procedure for determination of PGE–Re concentrations and 187Os/188Os ratios of the environmental reference material BCR-723 by isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) and negative thermal ionization mass spectrometry (N-TIMS), respectively. The sample is digested with inverse aqua regia in a Carius tube. After Os separation by CCl4 solvent extraction, separation and purification of PGE and Re from sample matrix elements is sequentially performed by a two-stage tandem column setup using cation exchange and N-benzoyl-N-phenylhydroxylamine (BPHA) extraction resin. Elution of 0.1 mol L−1 HCl efficiently removes interfering elements such as Zr, Hf, Mo, and Cd in the final purified sample prior to ID-ICP-MS determination of PGE and Re. Analyses of BCR-723 yield reproducible results and well-defined average Pt, Pd, Os, Ir, Ru, and Re concentrations of 79.8 ± 6.0, 4.6 ± 0.8, 0.37 ± 0.04, 0.23 ± 0.12, 1.1 ± 0.3, and 6.5 ± 0.1 ng g−1, respectively (95% confidence level; n = 10). The 187Os/188Os ratio of this standard was determined to be 0.537 ± 0.022 (95% confidence level; n = 10). These are the first comprehensive PGE and Re concentrations and Os isotopic compositions reported for BCR-723 and provide a well-characterized standard for assessing the data quality of autocatalyst PGE measurements and related research on environmental materials. The method was successfully employed in the determination of PGE and Re concentrations and Os isotopic compositions in urban road dust samples.

Graphical abstract: A method for determination of PGE–Re concentrations and Os isotopic compositions in environmental materials

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Publication details

The article was received on 19 Nov 2013, accepted on 24 May 2014 and first published on 27 May 2014


Article type: Paper
DOI: 10.1039/C3AY42064G
Citation: Anal. Methods, 2014,6, 5537-5545
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    A method for determination of PGE–Re concentrations and Os isotopic compositions in environmental materials

    P. Zhao, J. Li, L. Zhong, S. Sun and J. Xu, Anal. Methods, 2014, 6, 5537
    DOI: 10.1039/C3AY42064G

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