Lithium Isotopic Ratios by Single-Collector ICP-SFMS: A Critical Evaluation Using Reference Materials,Geostandards and Geoanalytical Research

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Lithium Isotopic Ratios by Single-Collector ICP-SFMS: A Critical Evaluation Using Reference Materials
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2021-06-11 , DOI: 10.1111/ggr.12396
Margareth S. Navarro ₁ , Gustavo M. Paula‐Santos ₁ , Thaís de P. Marteleto ₁ , Jacinta Enzweiler ₁

Affiliation

We deployed a procedure to measure Li isotope ratios on a single-collector sector field inductively coupled plasma mass spectrometer (ICP-SFMS) operated with a desolvation system and a high-sensitivity skimmer cone. Under optimised instrumental acquisition conditions, chromatographically separated analyte solutions containing 1 ng g⁻¹ of Li provided adequate sensitivity using analogue mode detection for both isotopes, without adverse memory effect. Unprecedented for this isotopic system, we estimated the expanded uncertainty (U; k = 2) associated with the obtained δ⁷Li values to validate the procedure. Were considered as potential contributors to the combined uncertainty estimation (u_c) the measurement intermediate precision, sample digestion and homogeneity, chromatographic separation, procedural blanks and homogeneity of the bracketing measurement standard (IRMM-016). The estimated U was on average (from results obtained with reference materials) 1.2‰ (k = 2). This is about twice the intermediate measurement precision (2s) of our data, highlighting the importance of evaluating other measurement uncertainty sources. The δ⁷Li values obtained for nineteen silicate rocks and one natural water agree with published values. We also provide the first δ⁷Li = (1.7 ± 1.2; 0.7)‰ (mean value ± U (k = 2); intermediate precision (2s); n = 13) for basalt RM BRP-1.

中文翻译：

单收集器 ICP-SFMS 的锂同位素比：使用参考材料的关键评估

我们部署了一个程序来测量单收集器扇形场电感耦合等离子体质谱仪 (ICP-SFMS) 上的锂同位素比，该质谱仪使用去溶剂化系统和高灵敏度截取锥运行。在优化的仪器采集条件下，色谱分离的含有 1 ng g ^-1 Li 的分析物溶液使用模拟模式检测两种同位素提供了足够的灵敏度，没有不利的记忆效应。该同位素系统前所未有，我们估计了与获得的 δ ^{7 Li 值相关的扩展不确定性 (}U ; k = 2)以验证该程序。被认为是组合不确定性估计的潜在贡献者_（uc) 包围测量标准（IRMM-016）的测量中间精度、样品消解和均质性、色谱分离、程序空白和均质性。估计的U平均为 1.2‰ ( k = 2)（根据参考材料获得的结果）。这大约是我们数据的中间测量精度 (2 s ) 的两倍，突出了评估其他测量不确定性来源的重要性。19 个硅酸盐岩石和 1 个天然水获得的 δ ^{7 Li 值与公布的值一致。}我们还提供了第一个δ ⁷ Li = (1.7 ± 1.2; 0.7)‰ (平均值 ± U ( k = 2); 中间精度 (2 s); n = 13) 用于玄武岩 RM BRP-1。

更新日期：2021-06-11

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