Development and Certification of Synthetic Zinc Isotopic Reference Materials,Geostandards and Geoanalytical Research

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Development and Certification of Synthetic Zinc Isotopic Reference Materials
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-07-13 , DOI: 10.1111/ggr.12354
Hai Lu ₁ , Jun Wang ₁ , Tongxiang Ren ₁ , Tao Zhou ₁ , Bing Wu ₁ , Yuanjing Zhou ₁ , Song Wang ₁ , Panshu Song ₁

Affiliation

The development, uncertainty evaluation and certification of eleven newly developed zinc isotope ratio reference materials (GBW04465‐04475) are described. The reference materials were gravimetrically prepared with enriched isotopic materials. During the certification, calibrated MC‐ICP‐MS measrements were performed. The improved techniques for certification in this study are as follows: (a) the isotopic compositions of purified enriched isotopes used for preparation of synthetic isotopic mixtures were obtained by total evaporation‐TIMS instead of the traditional iteration method; and (b) the mass discrimination effect in MC‐ICP‐MS was investigated through a series of isotopic mixtures with a wide range of isotopic compositions, and a non‐linearity effect of K factors was observed, and a new correction proposal was employed. The reference materials were certified with a point‐to‐point proposal instead of the traditional mean and stable K method. Further, the uncertainties were evaluated in detail, and contributions from characterisation, homogeneity and long‐term stability were taken into consideration. Among them, contributions from characterisation were particularly detailed: any budgets, for example, weighing and impurity checking, were clearly addressed, and the combined uncertainties were derived by a mathematical differentiation method. In addition, the traceability chain was established, directly pointing to the SI unit, the mole, and a between‐laboratory comparison was carried out to validate the reference values.

中文翻译：

合成锌同位素参考材料的开发和认证

描述了11种新开发的锌同位素比率参考材料（GBW04465-04475）的开发，不确定性评估和认证。用富集同位素物质重量分析制备参考物质。在认证过程中，进行了校准的MC‐ICP‐MS测量。本研究中的改进的认证技术如下：（a）通过全蒸发-TIMS代替传统的迭代方法获得用于制备合成同位素混合物的纯化富集同位素的同位素组成；（b）通过一系列具有广泛同位素组成的同位素混合物以及K的非线性效应，研究了MC-ICP-MS中的质量歧视效应观察到因素，并采用了新的校正建议。参考材料通过点对点提议进行认证，而不是传统的均值和稳定K方法。此外，对不确定性进行了详细评估，并考虑了特征，均质性和长期稳定性的影响。其中，表征的贡献特别详细：任何预算（例如称量和杂质检查）都得到了明确解决，并且组合的不确定性是通过数学微分方法得出的。此外，建立了可追溯性链，直接指向SI单位，摩尔，并进行了实验室间比较以验证参考值。

更新日期：2020-07-13

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