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Issue 11, 2015
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Determination of mass-dependent variations in tungsten stable isotope compositions of geological reference materials by double-spike and MC-ICPMS

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Abstract

We present a double-spike technique for precise determination of mass-dependent fractionation of tungsten (W) stable isotopes. Instrumental mass bias effects and isotope fractionation during W separation are corrected for by means of a 180W–183W double-spike added prior to sample dissolution. The separation of W from the matrix is achieved via three-step anion-exchange chromatography. Tungsten stable isotopic compositions were determined by multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS). Results are expressed relative to the NIST SRM 3136 W standard as the permil difference in 186W/184W (δ186W). The external reproducibility of the NIST SRM 3163 W standard is ±0.05‰ with an average composition of −0.01‰ on 186W/184W (2s.d., n = 171). Tungsten stable isotope compositions for USGS standard reference materials are as follows: AGV-2 (andesite; δ186W = 0.18 ± 0.05‰, 2s.d., n = 6), SDC-1 (mica schist; δ186W = 0.36 ± 0.05‰, 2s.d., n = 6), SDO-1 (shale; δ186W = 0.26 ± 0.06‰, 2s.d., n = 6), and manganese nodules NOD-A-1 (δ186W = 0.07 ± 0.05‰, 2s.d., n = 10) and NOD-P-1 (δ186W = 0.31 ± 0.04‰, 2s.d., n = 7). The long-term external reproducibility (2s.d.) for these rock standards is ±0.05‰.

Graphical abstract: Determination of mass-dependent variations in tungsten stable isotope compositions of geological reference materials by double-spike and MC-ICPMS

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Publication details

The article was received on 02 Jun 2015, accepted on 07 Sep 2015 and first published on 15 Sep 2015


Article type: Paper
DOI: 10.1039/C5JA00210A
Author version available: Download Author version (PDF)
Citation: J. Anal. At. Spectrom., 2015,30, 2334-2342
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    Determination of mass-dependent variations in tungsten stable isotope compositions of geological reference materials by double-spike and MC-ICPMS

    K. Abraham, J. Barling, C. Siebert, N. Belshaw, L. Gall and A. N. Halliday, J. Anal. At. Spectrom., 2015, 30, 2334
    DOI: 10.1039/C5JA00210A

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