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Rhenium‐Osmium Isotope Measurements of Geological Reference Material BIR ‐1a: Evaluation of Homogeneity and Implications for Method Validation and Quality Control
Author(s) -
Zhang Jing,
Li Jie,
Long Xiaoping,
Sun Shengling,
Yin Lu,
Dai Mengning
Publication year - 2017
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/ggr.12180
Subject(s) - homogeneity (statistics) , isotope , homogeneous , geology , rhenium , mafic , osmium , mineralogy , basalt , chemistry , analytical chemistry (journal) , geochemistry , environmental chemistry , mathematics , statistics , inorganic chemistry , biochemistry , physics , quantum mechanics , combinatorics , ruthenium , catalysis
To evaluate the homogeneity of geological reference material BIR ‐1a (basalt; United States Geological Survey, USGS ) for Re‐Os isotopic studies at the 0.2–1.0 g test portion size level, sixty‐three precise measurement results of Re and Os mass fractions and isotope amount ratios were obtained over an 18‐month period. These data reveal that the reference material has higher Re (0.691 ± 0.022 ng g −1 , 2 s , n = 63) and lower Os mass fractions (0.343 ± 0.089 ng g −1 , 2 s , n = 63) than UB ‐N (serpentinite, CRPG ) and is homogeneous in 187 Os/ 188 Os isotope amount ratio (0.13371 ± 0.00092, 2 s , n = 63) at the 0.2–1.0 g test portion size level. The results are essentially consistent with previous views indicating that BIR ‐1a gives precise measurement results for Re‐Os isotope amount ratio measurements at the 1 g test portion size level (Ishikawa et al ., Chemical Geology, 2014, 384, 27–46; Meisel and Horan, Reviews in Mineralogy and Geochemistry, 2016, 81, 89–106). Based on these new Re‐Os data and previous studies, we propose BIR ‐1a as a useful reference material that can be used in method validation and quality control and interlaboratory comparisons for studies dealing with mafic geological samples at test portion sizes of > 0.4 g.