A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169
A community-led calibration of the Zr isotope reference materials: NIST candidate RM 8299 and SRM 3169
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由社区主导的 Zr 同位素参考材料校准：NIST 候选 RM 8299 和 SRM 3169
DOI：
10.1039/d3ja00167a
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发表时间：
2023
影响因子：
3.4
通讯作者：
Young, Edward D.
中科院分区：
文献类型：
--
作者：
Tissot, François L.;Ibañez-Mejia, Mauricio;Rabb, Savelas A.;Kraft, Rebecca A.;Vocke, Robert D.;Fehr, Manuela A.;Schönbächler, Maria;Tang, Haolan;Young, Edward D.
随着锆稳定同位素研究领域从质量无关向质量相关同位素效应的研究迅速扩展，文献中出现了各种各样的锆标准。虽然这些标准中有几种已被提议作为理想的同位素参考材料（iRM），所有数据都应报告，但没有一种符合社区提出的成分和/或无利益冲突的分布要求。为了纠正这种情况，我们报告了社区主导的开发和校准定义锆同位素iRM的刻度的努力：NIST RM 8299。RM 8299是与美国国家标准与技术研究院（NIST）合作开发的，采用了广泛使用的SRM 3169锆标准溶液（质量分数认证），通过涉及三个实验室的实验室间研究对候选RM 8299进行了校准。我们的数据表明，候选RM 8299符合理想iRM的所有要求。它是一种同位素均质的高纯度参考物质，没有同位素异常，其成分与主要地质储层（大洋岛玄武岩）的成分相同。此外，RM 8299将由中立、无利益冲突的组织NIST策划和分发，并将以足够的数量生产，持续数十年。我们建议报告所有Zr同位素数据与RM 8299对照。我们的结果还表明，与候选RM 8299相比，SRM 3169批次#130920和#071226的组成不可区分。因此，使用RM 8299作为定义iRM的标度将能够直接比较所有未来数据与绝大多数现有文献数据，无论是质量无关还是质量相关同位素效应。为了便于将报告的δ94/90 Zr值与其他Zr标准品进行转换，我们提供了使用双加标法获得的RM 8299标度的高精度转换因子。
As the field of zirconium (Zr) stable isotopes is rapidly expanding from the study of mass-independent to that of mass-dependent isotope effects, a variety of Zr standards have appeared in the literature. While several of these standards have been proposed as the ideal isotope reference material (iRM) against which all data should be reported, none of them have been shown to meet the compositional and/or conflict-of-interest-free distribution requirements put forth by the community. To remedy this situation, we report on a community-led effort to develop and calibrate a scale defining iRM for Zr isotopes: NIST RM 8299. Developed in partnership with the National Institute of Standards and Technology (NIST) from the widely used SRM 3169 Zirconium Standard Solution (certified for mass fraction), the candidate RM 8299 was calibrated through an inter-laboratory study involving three laboratories. Our data show that candidate RM 8299 meets all requirements of an ideal iRM. It is an isotopically homogeneous, high-purity reference material, that is free of isotope anomalies, and whose composition is identical to that of a major geological reservoir (Ocean Island Basalts). Furthermore, RM 8299 will be curated and distributed by NIST, a neutral, conflict-of-interest free organization, and was produced in sufficient quantities to last multiple decades. We recommend that all Zr isotope data be reported against RM 8299. Our results also show that SRM 3169 lots #130920 and #071226 have indistinguishable composition compared to candidate RM 8299. Therefore, using RM 8299 as the scale defining iRM will enable direct comparison of all future data with the vast majority of the existing literature data, both for mass-independent and mass-dependent isotope effects. To facilitate conversion of δ94/90Zr values reported against other Zr standards, we provide high-precision conversion factors to the RM 8299 scale obtained using the double-spike method.