New sequential separation procedure for Sr, Nd and Pb isotope ratio measurement in geological material using MC-ICP-MS and TIMS
New sequential separation procedure for Sr, Nd and Pb isotope ratio measurement in geological material using MC-ICP-MS and TIMS
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DOI：
10.2343/geochemj.42.237
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发表时间：
2008-06
影响因子：
0.8
通讯作者：
A. Makishima;B. Nath;E. Nakamura
中科院分区：
文献类型：
--
作者：
A. Makishima;B. Nath;E. Nakamura
建立了一种适用于MC-ICP-MS和TIMS分析硅酸盐样品中Sr、Nd和Pb的三步序分离新化学方法。化学设计的目的是尽量减少蒸发步骤的数量，实现高通量，特别是当使用MC-ICP-MS。用HF-HClO4溶出0.5 mol l-1 HNO3的样品溶液，制备的微量元素分析用样品溶液可直接用于新化学。第一柱采用Sr树脂，收集Sr和Pb。回收的Sr溶液可直接吸入MC-ICP-MS中。将铅溶液干燥，再溶解，分成两等分，用双尖峰MC-ICP-MS测定。随后，lree通过填充阳离子交换树脂的第二柱收集。最后，在第三柱用Ln树脂从Sm中纯化Nd。回收的Nd溶液也可以直接雾化到MC-ICP-MS中。用MC-ICP-MS和TIMS测定了日本地质调查局的标准材料JB-3（玄武岩）的Sr和Nd同位素比值，验证了本研究建立的化学和质谱分析方法。
A new 3-step sequential separation chemistry for Sr, Nd and Pb from silicate samples, which is suitable for isotope analysis by MC-ICP-MS as well as TIMS, has been developed. The chemistry is designed to minimize the number of evaporation steps, enabling high throughput especially when MC-ICP-MS is employed. The sample solution in 0.5 mol l-1 HNO3 after digestion with HF-HClO4, which is prepared for trace element analysis, can be directly used in the new chemistry. In the first column using Sr resin, Sr and Pb are collected. The recovered solution for Sr can be directly aspirated into MC-ICP-MS. The Pb solution is dried, re-dissolved, separated into two aliquots and measured by double spike MC-ICP-MS. Subsequently, LREEs are collected by the second column packed with cation exchange resin. Finally, Nd was purified from Sm using Ln resin in the third column. The recovered Nd solution can also be directly nebulized into MC-ICP-MS. The Sr and Nd isotope ratios for the standard material JB-3 (basalt) from the Geological Survey of Japan by MC-ICP-MS and TIMS were reported to verify the chemistry and mass spectrometry developed in this study.