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High‐Precision Iron Isotope Analysis of Geological Reference Materials by High‐Resolution MC ‐ ICP ‐ MS
Author(s) -
He Yongsheng,
Ke Shan,
Teng FangZhen,
Wang Tiantian,
Wu Hongjie,
Lu Yinhuai,
Li Shuguang
Publication year - 2015
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2014.00304.x
Subject(s) - reproducibility , felsic , carbonatite , ultramafic rock , mineralogy , carbonate , analytical chemistry (journal) , calibration , isotope , chemistry , geology , geochemistry , environmental chemistry , chromatography , mafic , mathematics , physics , statistics , organic chemistry , quantum mechanics , mantle (geology)
We report high‐precision iron isotopic data for twenty‐two commercially available geological reference materials, including silicates, carbonatite, shale, carbonate and clay. Accuracy was checked by analyses of synthetic solutions with known Fe isotopic compositions but different matrices ranging from felsic to ultramafic igneous rocks, high Ca and low Fe limestone, to samples enriched in transition group elements (e.g., Cu, Co and Ni). Analyses over a 2‐year period of these synthetic samples and pure Fe solutions that were processed through the whole chemistry procedure yielded an average δ 56 Fe value of −0.001 ± 0.025‰ (2 s , n = 74), identical to the expected true value of 0. This demonstrates a long‐term reproducibility and accuracy of < 0.03‰ for determination of 56 Fe/ 54 Fe ratios. Reproducibility and accuracy were further confirmed by replicate measurements of the twenty‐two RM s, which yielded results that perfectly match the mean values of published data within quoted uncertainties. New recommended values and associated uncertainties are presented for interlaboratory calibration in the future.