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Iron isotopic analyses of geological reference materials on MC-ICP-MS with instrumental mass bias corrected by three independent methods

  • Chuanwei Zhu
  • Wenning Lu
  • Yongsheng He
  • Shan Ke
  • Hongjie Wu
  • Linan Zhang
Original Article
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Abstract

Here we report iron (Fe) isotopic data of three pure Fe solution standards (IRMM-014, GSB Fe, and NIST 3126a) and five widely used geological reference materials (RMs) from the United States Geological Survey and Geological Survey of Japan obtained on a Neptune Plus multi-collector–inductively coupled plasma–mass spectrometer (MC-ICP-MS) in our laboratory over the past 3 years. The instrumental mass bias was corrected by three independent methods: sample-standard bracketing (SSB), Ni doping + SSB, and 57Fe–58Fe double spike + SSB. Measurements reveal that both the Ni doping and double spike methods helped calibrate short-term fluctuations in mass bias. Collectively, almost all measurements of RMs yielded δ56Fe within ± 0.05 of recommended values, provided that each sample was measured four times on MC-ICP-MS. For the first time, new recommended values for NIST SRM3126a are reported (δ56Fe = 0.363 ± 0.006, 2SE, 95% CI; and δ57Fe = 0.534 ± 0.010, 2SE).

Keywords

Iron isotopic analyses Sample-standard bracketing Double spike Ni doping Reference materials Precision and accuracy 

Notes

Acknowledgements

Efficient editorial handling by Dr. Wang Binbin and Miss. Yue Peng and comments from Dr. Huang Jian and two other anonymous reviewers are highly appreciated. Prof. Jianming Zhu, Dr. Yinghuai Lu, Dr. Lijuan Xu, Miss Ruiying Li, Miss Xunan Meng, Mr. Lixin Zhang, Mr. Ting Gao, and Mr. Yang Wang kindly provided helps during the chemical procedures and MC-ICP-MS measurements. This work was financially supported by the National Natural Science Foundation of China (41473016) and the State Key Laboratory of Geological Processes and Mineral Resources.

Supplementary material

11631_2018_284_MOESM1_ESM.pdf (1.4 mb)
Supplementary material 1 (PDF 1472 kb)

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Copyright information

© Science Press, Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Chuanwei Zhu
    • 1
  • Wenning Lu
    • 1
  • Yongsheng He
    • 1
  • Shan Ke
    • 1
  • Hongjie Wu
    • 1
  • Linan Zhang
    • 1
  1. 1.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijingChina

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