NIST RM 8301 Boron Isotopes in Marine Carbonate (Simulated Coral and Foraminifera Solutions): Inter-laboratory d 11 B and Trace Element Ratio Value Assignment
NIST RM 8301 Boron Isotopes in Marine Carbonate (Simulated Coral and Foraminifera Solutions): Inter-laboratory d 11 B and Trace Element Ratio Value Assignment
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NIST RM 8301 海洋碳酸盐中的硼同位素（模拟珊瑚和有孔虫溶液）：实验室间 d 11 B 和痕量元素比率值分配
DOI：
10.1111/ggr.12363
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发表时间：
2020
影响因子：
3.8
通讯作者：
Stewart J
中科院分区：
文献类型：
--
作者：
Stewart J
11B/10B 硼同位素比 (δ11BSRM951) 和海洋碳酸盐的微量元素组成是了解碳循环 (pH) 和古海洋变化的关键指标。然而，方法验证和实验室之间结果的可比性需要碳酸盐参考材料。在这里，我们报告了一项实验室间比较研究的结果，将 δ11BSRM951 和微量元素成分分配给新的合成海洋碳酸盐标准物质 (RM)、NIST RM 8301（珊瑚）和 NIST RM 8301（有孔珊瑚），并评估实验室之间数据的差异。 NIST RM 8301（珊瑚）（+24.17‰±0.18‰）和 NIST RM 8301（Foram）（+14.51‰±0.17‰）解决方案中的 δ11BSRM951 的未经认证的参考值和扩展的 95% 不确定性是使用实验室间数据通过共识方法分配的。实验室之间报告的差异比之前的一些实验室间比较要小得多，但差异仍然可能导致计算出的海水 pH 值存在较大差异。同样，实验室之间报告的微量元素信息的变异性（例如，Mg/Ca ± 5% RSD）通常大于单个实验室内的变异性（例如，Mg/Ca < 2%）。这种差异可能会使代理重建的海水温度改变超过 2°C。这些现已得到充分表征的解决方案是有用的参考材料，可帮助古海洋学界建立对过去海洋变化的全面了解。
The boron isotopic ratio of11B/10B (δ11BSRM951) and trace element composition of marine carbonates are key proxies for understanding carbon cycling (pH) and palaeoceanographic change. However, method validation and comparability of results between laboratories requires carbonate reference materials. Here, we report results of an inter‐laboratory comparison study to both assign δ11BSRM951and trace element compositions to new synthetic marine carbonate reference materials (RMs), NIST RM 8301 (Coral) and NIST RM 8301 (Foram) and to assess the variance of data among laboratories. Non‐certified reference values and expanded 95% uncertainties for δ11BSRM951in NIST RM 8301 (Coral) (+24.17‰ ± 0.18‰) and NIST RM 8301 (Foram) (+14.51‰ ± 0.17‰) solutions were assigned by consensus approach using inter‐laboratory data. Differences reported among laboratories were considerably smaller than some previous inter‐laboratory comparisons, yet discrepancies could still lead to large differences in calculated seawater pH. Similarly, variability in reported trace element information among laboratories (e.g., Mg/Ca ± 5% RSD) was often greater than within a single laboratory (e.g., Mg/Ca < 2%). Such differences potentially alter proxy‐reconstructed seawater temperature by more than 2 °C. These now well‐characterised solutions are useful reference materials to help the palaeoceanographic community build a comprehensive view of past ocean changes.