High‐Precision Zinc Isotopic Measurement of Certified Reference Materials Relevant to the Environmental, Earth, Planetary and Biomedical Sciences,Geostandards and Geoanalytical Research

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High‐Precision Zinc Isotopic Measurement of Certified Reference Materials Relevant to the Environmental, Earth, Planetary and Biomedical Sciences
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-06-09 , DOI: 10.1111/ggr.12341
Matthew Druce _{1,

2} , Claudine H. Stirling _{1,

2} , John M. Rolison ₃

Affiliation

The zinc (Zn) stable isotope system has emerged as a powerful tool for investigating natural and anthropogenic processes of interest to disciplines ranging from the Earth and planetary sciences to biomedical research. In nature, Zn isotopes typically fractionate (⁶⁶Zn/⁶⁴Zn) within the range of −1 and +1 permil (‰), and however, analytical limitations restrict the application of the Zn isotope system. Specifically, there is a lack of well‐characterised matrix‐matched reference materials covering most Zn isotope applications that are essential for validating laboratory performance, particularly given the contamination prone nature of Zn. Furthermore, the increasing demand for analysis of size‐limited materials and sample types displaying small, sub‐permil level Zn isotope variations requires improvements in measurement procedures. To address these limitations, the δ⁶⁶Zn values of two pure Zn solutions and eighteen reference materials including the previously uncharacterised RGM‐2, BCR‐279, DOLT‐4, DOLT‐5, NASS‐7, SBC‐1, SGR‐1b, MESS‐3 and HISS‐1, and the understudied QLO‐1, SDC‐1, BCR‐414, NASS‐6 and COQ‐1 materials are reported. Furthermore, a ⁷⁰Zn‐⁶⁷Zn double‐spike design has been implemented that routinely achieves intermediate measurement precision better than ± 0.02‰. This represents at least a two‐fold improvement when compared with other double‐spike designs, providing a robust platform of δ⁶⁶Zn values required for quality control procedures.

中文翻译：

与环境，地球，行星和生物医学相关的认证参考物质的高精度锌同位素测量

锌（Zn）稳定同位素系统已成为研究自然和人为过程的有力工具，这些过程涉及从地球和行星科学到生物医学研究等学科。自然界中，锌同位素通常是分馏的（⁶⁶ Zn / ⁶⁴Zn）在-1和+1 permil（‰）的范围内，但是，分析限制限制了Zn同位素系统的应用。特别是，缺乏涵盖大多数锌同位素应用的，表征良好的基质匹配参考材料，这对于验证实验室性能至关重要，特别是考虑到锌易于污染的性质。此外，对尺寸受限的材料和样品类型（显示出低于亚密耳级的Zn同位素变化）进行分析的需求日益增加，因此需要改进测量程序。为了解决这些限制，δ ⁶⁶两种纯锌溶液和18种参考物质的锌值，包括以前未表征的RGM-2，BCR-279，DOLT-4，DOLT-5，NASS-7，SBC-1，SGR-1b，MESS-3和HISS-1 ，并且报告了尚未充分研究的QLO-1，SDC-1，BCR-414，NASS-6和COQ-1材料。此外，还采用了⁷⁰ Zn- ⁶⁷ Zn双尖峰设计，通常可实现优于±0.02‰的中间测量精度。当与其他的双尖峰的设计相比，提供了δ的健壮平台这代表至少两倍的改善⁶⁶进行质量控制程序所需的锌的值。

更新日期：2020-06-09

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