Determination of mass-dependent variations in nickel isotope compositions using double spiking and MC-ICPMS

Gall, Louise and Williams, Helen and Siebert, Christopher and Halliday, Alex (2012) Determination of mass-dependent variations in nickel isotope compositions using double spiking and MC-ICPMS. Journal of Analytical Atomic Spectrometry, 27 (1). pp. 137-145. ISSN 0267-9477 ESSN: 1364-5544 DOI 10.1039/C1JA10209E

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Abstract

We present a new technique for the accurate and precise determination of mass-dependent variations in nickel isotope compositions in geological materials. Our method involves an ion-exchange procedure comprising three columns and utilising the ability of Ni to form strong complexes with both ammonia and dimethylglyoxime. The separation procedure is independent of sample pH and works even for samples with large matrix to analyte ratios. Processed Ni solutions are free of matrix elements and direct isobars of Ni, and the yield is normally 85–95%. The purified Ni solutions were analysed using a Nu Plasma, multi-collector inductively coupled plasma mass spectrometer (MC-ICPMS), where instrumental mass fractionation—together with potential isotopic fractionation during chemical separation due to incomplete yield—was corrected for by a double-spike technique, where samples were spiked prior to column chemistry. Tests performed on both mixtures of synthetic and natural terrestrial standards demonstrates that the method is accurate. Replicate measurements of USGS reference materials (peridotite PCC-1, basalt BHVO-2, and shale SCo-1) yield a long-term external reproducibility (2 s.d.) of typically ± 0.07‰, ± 0.1‰, and ± 0.14‰ for 60Ni/58Ni, 61Ni/58Ni, and 62Ni/58Ni respectively.

Item Type: Article
Uncontrolled Keywords: NILAREP
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title: Journal of Analytical Atomic Spectrometry
Volume: 27
Page Range: pp. 137-145
Identification Number: 10.1039/C1JA10209E
Depositing User: Sarah Humbert
Date Deposited: 20 Jul 2016 21:42
Last Modified: 20 Jul 2016 21:45
URI: http://eprints.esc.cam.ac.uk/id/eprint/3688

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