地大北京标准物质Ca同位素数据（2015-2022）
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我们报告了过去八年中在一台 Triton Plus 热电离质谱仪（TIMS）上对五种广泛使用的参考物质（SRM915a、SRM915b、大西洋海水、BHVO-2 和 BCR-2）进行的钙同位素测量结果。考虑到每个纯化样品通常至少测量六次，δ44/42Ca、δ44/40Ca 和 ε40/44Ca 的长期重现性（2SD）分别为 0.048‰、0.085‰ 和 0.92。为将基于 SRM915a 少量测量值进行漂移校正所产生的不确定性降至最低，我们建议在每次分析过程中，对所有特征明确的参考物质（与推荐值相比）所定义的漂移进行校正，然后报告未知样品的结果。根据模拟结果，如果每个样品测量八次，δ44/42Ca、δ44/40Ca 和 ε40/44Ca 的长期重现性（2SD）可分别提高至 0.033‰、0.044‰ 和 0.64。
We report calcium isotope measurements of five widely used reference materials (SRM915a, SRM915b, Atlantic seawater, BHVO-2, and BCR-2) obtained over the past eight years using a Triton Plus thermal ionization mass spectrometer (TIMS). Given that each purified sample was typically measured at least six times, the long-term reproducibilities (2SD) of δ⁴⁴/⁴²Ca, δ⁴⁴/⁴⁰Ca, and ε⁴⁰/⁴⁴Ca are 0.048‰, 0.085‰, and 0.92, respectively. To minimize the uncertainty introduced by drift correction based on a small number of measurements of SRM915a, we recommend correcting for the drift defined by all well-characterized reference materials (relative to their recommended values) during each analytical run before reporting the results of unknown samples. Based on simulation results, the long-term reproducibilities (2SD) of δ⁴⁴/⁴²Ca, δ⁴⁴/⁴⁰Ca, and ε⁴⁰/⁴⁴Ca can be improved to 0.033‰, 0.044‰, and 0.64, respectively, if each sample is measured eight times.
