A Revisited Purification of Li for ‘Na Breakthrough’ and its Isotopic Determination by MC‐ICP‐MS,Geostandards and Geoanalytical Research

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A Revisited Purification of Li for ‘Na Breakthrough’ and its Isotopic Determination by MC‐ICP‐MS
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-01-06 , DOI: 10.1111/ggr.12305
Lin Xu _{1,

2,

3} , Chongguang Luo ₂ , Hanjie Wen _{2,

3}

Affiliation

The accurate and precise determination of Li isotopic composition by MC‐ICP‐MS suffers from the poor performance of traditional column chromatography. Previously established chromatographic processes cannot completely remove Na in complex geological samples, which is currently interpreted to be a result of Na breakthrough. In this study, Na breakthrough during single‐column purification was found to differ between simply artificial Na‐containing sample solutions, where a little Na residue was found, and silicate rocks, where a large amount of breakthrough occurred. A revised two‐step column purification for Li using 0.5 and 0.3 mol l⁻¹ HCl as eluents was designed to remove the Na. This modified method achieves high‐efficiency Li purification from Na and consequently avoiding high Na/Li ratio interference for subsequent MC‐ICP‐MS analyses. The proposed method was validated by the analysis of a series of reference materials, including Li₂CO₃ (IRMM‐016, ‐0.10‰), basalt (BCR‐2: 2.68‰; BHVO‐2: 4.39‰), andesite (AGV‐2: 6.46‰; RGM‐2: 2.59‰), granodiorite (GSP‐2: −0.87‰) and seawater (CASS‐5, 30.88‰). This work reports early Na appearance prior to the elution curves in chromatography and emphasises its influence for subsequent Li isotope measurement. Based on the findings, the established two‐step method would be more secure than single‐column chemistry for Li purification.

中文翻译：

锂的'Na突破'的重新纯化及其通过MC-ICP-MS的同位素测定

传统的柱色谱法性能较差，使用MC‐ICP‐MS准确，准确地测定Li同位素组成。先前建立的色谱方法无法完全去除复杂地质样品中的Na，目前认为这是Na突破的结果。在这项研究中，发现单柱纯化过程中的Na突破在仅含有少量Na残留的简单人工含Na样品溶液与发生大量突破的硅酸盐岩石之间是不同的。使用0.5和0.3 mol l ^-1的Li的修订的两步柱纯化设计使用HCl作为洗脱液以去除Na。这种改进的方法实现了从Na的高效Li纯化，因此避免了随后的MC-ICP-MS分析的高Na / Li比干扰。通过对一系列参考材料进行分析验证了该方法的有效性，这些参考材料包括Li ₂ CO ₃（IRMM‐016，‐0.10‰），玄武岩（BCR‐2：2.68‰; BHVO‐2：4.39‰）和安山岩（AGV） ‐2：6.46‰; RGM‐2：2.59‰），花岗闪长岩（GSP‐2：−0.87‰）和海水（CASS‐5，30.88‰）。这项工作报告了色谱图中洗脱曲线之前Na的早期出现，并强调了其对后续Li同位素测量的影响。基于这些发现，所建立的两步法将比单柱化学法更安全。

更新日期：2020-01-06

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