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    Interlaboratory comparison of magnesium isotopic compositions of 12 felsic to ultramafic igneous rock standards analyzed by MC-ICPMS

    Teng, F.-Z. and Yin, Q.-Z. and Ullmann, C.V. and Chakrabarti, R. and Pogge von Strandmann, Philip A.E. and Yang, W. and Li, W.-Y. and Ke, S. and Sedaghatpour, F. and Wimpenny, J. and Meixner, A. and Romer, R.L. and Wiechert, U. and Jacobsen, S.B. (2015) Interlaboratory comparison of magnesium isotopic compositions of 12 felsic to ultramafic igneous rock standards analyzed by MC-ICPMS. Geochemistry, Geophysics, Geosystems 16 (9), pp. 3197-3209. ISSN 1525-2027.

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    Abstract

    To evaluate the interlaboratory mass bias for high-precision stable Mg isotopic analysis of natural materials, a suite of silicate standards ranging in composition from felsic to ultramafic were analyzed in five laboratories by using three types of multicollector inductively coupled plasma mass spectrometer (MC-ICPMS). Magnesium isotopic compositions from all labs are in agreement for most rocks within quoted uncertainties but are significantly (up to 0.3‰ in 26Mg/24Mg, >4 times of uncertainties) different for some mafic samples. The interlaboratory mass bias does not correlate with matrix element/Mg ratios, and the mechanism for producing it is uncertain but very likely arises from column chemistry. Our results suggest that standards with different matrices are needed to calibrate the efficiency of column chemistry and caution should be taken when dealing with samples with complicated matrices. Well-calibrated standards with matrix elements matching samples should be used to reduce the interlaboratory mass bias.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Mg isotopes, interlaboratory comparison, mass bias, MC-ICPMS
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences
    Depositing User: Philip Pogge von strandmann
    Date Deposited: 23 Feb 2016 17:25
    Last Modified: 28 Sep 2017 05:50
    URI: http://eprints.bbk.ac.uk/id/eprint/14467

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