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Issue 1, 2014
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High-precision copper and iron isotope analysis of igneous rock standards by MC-ICP-MS

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Abstract

Stable isotopic systematics of Cu and Fe are two important tracers for geological and biological processes. Generally, separation of Cu and Fe from a matrix was achieved by two independent, completely different methods. In this study, we report a method for one-step anion-exchange separation of Cu and Fe from a matrix for igneous rocks using strong anion resin AG-MP-1M. Cu and Fe isotopic ratios were measured by multi-collector inductively coupled plasma mass-spectrometry (Neptune plus) using a sample–standard bracketing method. External normalization using Zn to correct for instrumental bias was also adopted for Cu isotopic measurement of some samples. In addition, all parameters that could affect the accuracy and precision of isotopic measurements were examined. Long-term external reproducibility better than ±0.05‰ (2SD) for δ65Cu and ±0.049‰ (2SD) for δ56Fe was routinely obtained. Cu and Fe isotopic compositions of commercially accessible igneous rock standards including basalt, diabase, amphibolite, andesite and granodiorite were measured using this method. δ65Cu values of igneous rock standards vary from −0.01 to +0.39‰ (n = 11) with an overall range (0.40‰) that exceeds about 8 times that of the current analytical precision. The improved precisions of stable Cu isotopic analysis thus demonstrate that igneous rocks are not homogeneous in Cu isotopic composition. The procedure for one-step separation of Cu and Fe and high-precision analysis of Cu and Fe isotopic ratios have an important advantage for economical and efficient study of stable Cu and Fe isotopic systematics in geological and biological fields.

Graphical abstract: High-precision copper and iron isotope analysis of igneous rock standards by MC-ICP-MS

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Publication details

The article was received on 12 Jul 2013, accepted on 09 Oct 2013 and first published on 09 Oct 2013


Article type: Paper
DOI: 10.1039/C3JA50232E
Citation: J. Anal. At. Spectrom., 2014,29, 122-133
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    High-precision copper and iron isotope analysis of igneous rock standards by MC-ICP-MS

    S. Liu, D. Li, S. Li, F. Teng, S. Ke, Y. He and Y. Lu, J. Anal. At. Spectrom., 2014, 29, 122
    DOI: 10.1039/C3JA50232E

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