Separation of Heavy Lanthanoids by Flash Column Chromatography for Precise Determination of Er and Yb Isotope Compositions in Rock Samples
Separation of Heavy Lanthanoids by Flash Column Chromatography for Precise Determination of Er and Yb Isotope Compositions in Rock Samples
复制标题
采用快速柱色谱法分离重镧系元素以精确测定岩石样品中的 Er 和 Yb 同位素组成
DOI：
10.1111/ggr.12317
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发表时间：
2020
影响因子：
3.8
通讯作者：
Nakahara Masaki
中科院分区：
文献类型：
--
作者：
Yokoyama Tetsuya;Fukai Ryota;Nakahara Masaki
我们提出了一种新的柱化学技术，用于通过超细粒度 LN 树脂 (20–50 µm) 定量分离重镧系元素，特别强调 Er 和 Yb 的纯化以进行同位素分析。为了在合理的时间范围内实现Er和Yb的定量分离，采用了快速柱色谱，该色谱柱连接到新设计的真空箱系统，从而使洗脱速度比常规重力流操作的柱程序加快了十倍。 Er 和 Yb 的回收率被证实约为 100%，这对于抑制色谱过程中 Er 和 Yb 同位素的质量无关分馏的影响非常重要。此外，我们还利用多静态和/或动态方法通过热电离质谱 (TIMS) 开发了精确的 Er 和 Yb 同位素测量。此外，在大多数情况下，测量的四个陆地岩石样品的 Er 和 Yb 同位素组成与市售的 Er 和 Yb Alfa Aesar 溶液的组成无法区分。这项工作中提出的新方法将有助于未来研究各种地质材料中的重镧系元素。
We present a new column chemistry technique for the quantitative separation of heavy lanthanoids by an ultra‐fine‐grained LN resin (20–50 µm) with a specific emphasis on the purification of Er and Yb for their isotopic analysis. To achieve the quantitative separation of Er and Yb within a reasonable timescale, flash column chromatography was applied, where the column was attached to a newly designed vacuum box system, thus accelerating the elution speed by ten times compared with that of the normal column procedure operated by gravity flow. The recovery yields of Er and Yb were confirmed to be approximately 100%, which is important to suppress the effect of the mass‐independent fractionation of the Er and Yb isotopes during chromatography. Additionally, we have developed precise Er and Yb isotope measurements by thermal ionisation mass spectrometry (TIMS) using multistatic and/or dynamic methods. Moreover, in most cases, the Er and Yb isotope compositions of the measured four terrestrial rock samples were indistinguishable from those of the commercially available Er and Yb Alfa Aesar solutions. The new method presented in this work will be useful for future studies on heavy lanthanoids in various geological materials.