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

Gall, Louise, Williams, Helen, 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. 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.

Document Type: Article
Additional Information: WOS:000298548000017
Keywords: DISTRIBUTION COEFFICIENTS; EXCHANGE BEHAVIOR; IRON-METEORITES; ELEMENTS; SPECTROMETRY; ANOMALIES
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1039/C1JA10209E
ISSN: 0267-9477
Date Deposited: 10 Jan 2013 09:38
Last Modified: 09 Jun 2017 12:08
URI: http://oceanrep.geomar.de/id/eprint/19947

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