NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis
NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis
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DOI：
10.1111/ggr.12296
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发表时间：
2019-10
影响因子：
3.8
通讯作者：
Michael Weber;F. Lugli;B. Hattendorf;D. Scholz;R. Mertz‐Kraus;D. Guinoiseau;K. Jochum
中科院分区：
文献类型：
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作者：
Michael Weber;F. Lugli;B. Hattendorf;D. Scholz;R. Mertz‐Kraus;D. Guinoiseau;K. Jochum
通过 MC-ICP-MS 对碳酸盐中的 Sr 同位素进行原位测量受到与感兴趣样品相匹配的合适微量分析参考材料 (RM) 的可用性的限制。尽管有几种 Sr 质量分数 > 1000 µg g−1 的良好表征的碳酸盐标准物质可供使用，但缺乏具有较低 Sr 质量分数的良好表征的碳酸盐微分析 RM。在这里，我们提出了一种新的合成碳酸盐纳米粉末 RM，其 Sr 质量分数约为。 500 µg g−1 适用于微量分析 Sr 同位素研究（“NanoSr”）。 NanoSr 通过基于溶液和原位技术进行分析。使用 EPMA（Ca 质量分数）以及不同实验室的激光烧蚀和溶液 ICP-MS 测定元素质量分数。 87Sr/86Sr 比率是通过成熟的 Sr 同位素测量方法确定的，为 0.70756 ± 0.00003 (2s)。通过 LA-MC-ICP-MS 测定材料的 Sr 同位素微观均匀性，得出 87Sr/86Sr 比值分别为 0.70753 ± 0.00007 (2s) 和 0.70757 ± 0.00006 (2s)，与不确定范围内的溶液数据一致。因此，这种新的参考材料非常适合监测和校正低 Sr、低 REE 碳酸盐样品的微量分析 Sr 同位素测量。 NanoSr 可从相应作者处获得。
The in situ measurement of Sr isotopes in carbonates by MC‐ICP‐MS is limited by the availability of suitable microanalytical reference materials (RMs), which match the samples of interest. Whereas several well‐characterised carbonate reference materials for Sr mass fractions > 1000 µg g−1 are available, there is a lack of well‐characterised carbonate microanalytical RMs with lower Sr mass fractions. Here, we present a new synthetic carbonate nanopowder RM with a Sr mass fraction of ca. 500 µg g−1 suitable for microanalytical Sr isotope research (‘NanoSr’). NanoSr was analysed by both solution‐based and in situ techniques. Element mass fractions were determined using EPMA (Ca mass fraction), as well as laser ablation and solution ICP‐MS in different laboratories. The 87Sr/86Sr ratio was determined by well‐established bulk methods for Sr isotope measurements and is 0.70756 ± 0.00003 (2s). The Sr isotope microhomogeneity of the material was determined by LA‐MC‐ICP‐MS, which resulted in 87Sr/86Sr ratios of 0.70753 ± 0.00007 (2s) and 0.70757 ± 0.00006 (2s), respectively, in agreement with the solution data within uncertainties. Thus, this new reference material is well suited to monitor and correct microanalytical Sr isotope measurements of low‐Sr, low‐REE carbonate samples. NanoSr is available from the corresponding author.