The δ 60/58 Ni Values of Twenty‐Six Selected Geological Reference Materials

The high‐precision δ 60/58 Ni values of twenty‐six geological reference materials, including igneous rocks, sedimentary rocks, stream sediments, soils and plants are reported. The δ 60/58 Ni values of all samples were determined by double‐spike MC‐ICP‐MS (Nu Plasma III). Isotope standard solution (NIST SRM 986) and geological reference materials (BHVO‐2, BCR‐2, JP‐1, PCC‐1, etc.) were used to evaluate the measurement bias and intermediate precision over a period of six months. Our results show that the intermediate precision of Ni isotope determination was 0.05‰ (2 s , n  = 69) for spiked NIST SRM 986 and typically 0.06‰ for actual samples, and the δ 60/58 Ni NIST SRM 986 values were in excellent agreement with previous studies. Eighteen high‐precision Ni isotope ratios of geological reference materials are first reported here, and their δ 60/58 Ni values varied from −0.27‰ to 0.52‰, with a mean of 0.13 ± 0.34‰ (2 s , n  = 18). Additionally, SGR‐1b (0.56 ± 0.04‰, 2 s ), GSS‐1 (−0.27 ± 0.06‰, 2 s ), GSS‐7 (−0.11 ± 0.01‰, 2 s ), GSD‐10 (0.46 ± 0.06‰, 2 s ) and GSB‐12 (0.52 ± 0.06‰, 2 s ) could potentially serve as candidate reference materials for Ni isotope fractionation and comparison of Ni isotopic compositions among different laboratories.