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Issue 2, 2008
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Measurement of 234U/238U and 230Th/232Th in volcanic rocks using the Neptune MC-ICP-MS

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Abstract

We present a new multicollector inductively coupled plasma mass spectrometric (MC-ICP-MS) method for measuring isotopic ratios of 234U/238U and 230Th/232Th in volcanic rocks using the Thermo Fisher Neptune. Uranium isotope measurements using SRM U010 as bracketing standard produce agreement within several permil for NBL 112A, REMP-18, as well as for equilibrium rock standards. We also demonstrate that uranium standards are not appropriate for correcting thorium isotopic measurements due to differences between U and Th in both mass bias and mass-dependent ion transmission. Use of the thorium synthetic standard, UCSC ThA, as a bracketing standard produces data that agree well with ‘accepted values’ for other synthetic Th isotope standards and equilibrium rock standards.

Graphical abstract: Measurement of 234U/238U and 230Th/232Th in volcanic rocks using the Neptune MC-ICP-MS

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Publication details

The article was received on 02 Mar 2007, accepted on 12 Sep 2007 and first published on 11 Oct 2007


Article type: Paper
DOI: 10.1039/B703193A
Citation: J. Anal. At. Spectrom., 2008,23, 173-180
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    Measurement of 234U/238U and 230Th/232Th in volcanic rocks using the Neptune MC-ICP-MS

    L. Ball, K. W. W. Sims and J. Schwieters, J. Anal. At. Spectrom., 2008, 23, 173
    DOI: 10.1039/B703193A

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