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 3years. The instrumental mass bias was corrected by three independent methods: sample-standard bracketing (SSB), Ni doping+SSB, and Fe-57-Fe-58 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 Fe-56 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 (Fe-56=3D0.363 +/- 0.006, 2SE, 95% CI; and Fe-57=3D0.534 +/- 0.010, 2SE).
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