Lithium, magnesium and sulfur purification from seawater using an ion chromatograph with a fraction collector system for stable isotope measurements
Lithium, magnesium and sulfur purification from seawater using an ion chromatograph with a fraction collector system for stable isotope measurements
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使用带有馏分收集器系统的离子色谱仪从海水中纯化锂、镁和硫，以进行稳定同位素测量
DOI：
10.1016/j.chroma.2017.11.052
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发表时间：
2018
影响因子：
4.1
通讯作者：
Ohkouchi Naohiko
中科院分区：
文献类型：
--
作者：
Yoshimura Toshihiro;Araoka Daisuke;Tamenori Yusuke;Kuroda Junichiro;Kawahata Hodaka;Ohkouchi Naohiko
我们描述了一种离线分离纯化锂、镁和S的方法的质量鉴定和验证，该方法使用离子色谱仪与自动分馏收集器相耦合，以便在稳定同位素测量之前使用。锂和镁稳定同位素比值均观察到明显的亚组分质量分馏。较轻的Li和较重的Mg同位素优先被柱子保留，导致7Li/6Li和26 mg/24 mg的偏置分别高达85.8‰和0.95‰。从海水中分离出的锂、镁、S的同位素组成分别为：δ7LiL-SVEC= +30.9‰，δ26MgDSM3= −0.83 ± 0.10‰，δ34SVCDT= +19.4 ± 0.6‰，各色谱峰完全恢复，无论是否使用化学抑制剂，测定结果均与文献值吻合较好。该提纯方法能够使用各种质谱学技术对样品进行多同位素分析，例如多收集器电感耦合等离子体和热电离质谱。
We describe the mass descrimination and validation of an offline method for purification of Li, Mg and S with an ion chromatograph coupled to an automated fraction collector for use prior to stable isotope measurements. Significant sub-fraction mass fractionation was observed for both the Li and the Mg stable isotope ratios. The lighter Li and heavier Mg isotopes were preferentially retained by the column, resulting in7Li/6Li and26Mg/24Mg biases up to 85.8‰ and 0.95‰, respectively. The isotopic compositions of Li, Mg, and S separated from seawater were δ7LiL-SVEC= +30.9‰, δ26MgDSM3= −0.83 ± 0.10‰, and δ34SVCDT= +19.4 ± 0.6‰; each chromatographic peak was completely recovered, and the results were in good agreement with the published values regardless of whether or not chemical suppressor was used. The purification method enables multi-isotope analysis of a sample using various mass spectrometry techniques, such as multiple-collector inductively coupled plasma and thermal ionization mass spectrometry.