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Chemical procedure for Zn purification and double spike method for high precision measurement of Zn isotopes by MC-ICPMS
International Journal of Mass Spectrometry ( IF 1.8 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.ijms.2020.116413
Quentin Amet , Caroline Fitoussi

Abstract We have developed a new technique for Zn separation and high precision isotope measurement of geological and cosmochemical samples. The protocol includes sample digestion, chemical separation and purification with ion-exchange chromatography and a double spike isotopic measurement using a MC-ICPMS. An analytical precision of 0.02‰ (2SD) for 66Zn/64Zn was obtained by multiple measurements of a secondary standard (JMC-Lyon). In order to test the accuracy of our method, we analyzed the Zn isotopic composition of the geological reference materials BHVO-2, AGV-2, BIR-1, BCR-2 and JB-2, which are consistent with previous measurements from the literature. The measurements of geological reference standards show an external reproducibility ranging between 0.02 and 0.05‰ (2SD). This study provides a high precision and accuracy Zn isotope double spike technique for geological and cosmochemical rock samples, while requiring only 28 ng Zn per analysis, and is therefore suitable for the study of high temperature igneous or cosmochemical processes.

中文翻译:

用 MC-ICPMS 对锌同位素进行高精度测量的 Zn 纯化化学程序和双加标法

摘要 我们开发了一种用于地质和宇宙化学样品的锌分离和高精度同位素测量的新技术。该协议包括使用离子交换色谱进行样品消化、化学分离和纯化,以及使用 MC-ICPMS 进行双尖峰同位素测量。通过对二级标准 (JMC-Lyon) 进行多次测量,66Zn/64Zn 的分析精度为 0.02‰ (2SD)。为了测试我们方法的准确性,我们分析了地质参考材料 BHVO-2、AGV-2、BIR-1、BCR-2 和 JB-2 的 Zn 同位素组成,这与之前文献中的测量结果一致. 地质参考标准的测量显示外部再现性介于 0.02 和 0.05‰ (2SD) 之间。
更新日期:2020-11-01
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