Single-Stage Extraction Technique for Ce Stable Isotopes and Measurement by MC-ICP-MS,Analytical Chemistry

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Single-Stage Extraction Technique for Ce Stable Isotopes and Measurement by MC-ICP-MS
Analytical Chemistry ( IF 6.7 ) Pub Date : 2021-08-29 , DOI: 10.1021/acs.analchem.1c01663
Fang Liu ₁ , Zhaofeng Zhang ₁ , Xin Li ₁ , Yajun An ₁ , Yufei Liu _{2,

3} , Kaiyun Chen ₄ , Zhian Bao ₄ , Chunhui Li ₁

Affiliation

The separation of Ce from other rare earth elements has not been well established because of their similar geochemical properties. In this study, we report a single-stage extraction technique to purify Ce from natural samples with Eichrom DGA resin. This method separates Ce effectively from matrices and interfering elements, such as Ba, La, and Nd. The Ce elution curve would not drift with different Ce loading masses and rock types. The Ce isotope compositions were measured using a Thermo Scientific Neptune Plus multicollector (MC)-inductively coupled plasma (ICP)-mass spectrometry (MS) instrument. The instrumental mass bias of Ce isotopes was corrected with a sample-standard bracketing combined with a Sm-doping method. The δ¹⁴²Ce values of standard solutions (CDUT-Ce and JMC304) relative to National Institute of Standards and Technology SRM 3110 measured were +0.128 ± 0.028‰ (2SD, N = 30) and 0.005 ± 0.038‰ (2SD, N = 30), respectively. The reproducibility for δ¹⁴²Ce was better than 0.040‰. The Ce isotopic compositions of nine United States Geological Survey standard rocks, including carbonatite, basalt, andesite, quartz latite, dolerite, rhyolite, and granodiorite, were measured in this study. Our result showed that δ¹⁴²Ce values of these rocks varied slightly, indicating that insignificant fractionation occurred during igneous processes. The technique proposed in this study is simple and time-efficient, which is beneficial for further studies on Ce isotope geochemistry.

中文翻译：

Ce 稳定同位素的单级提取技术和 MC-ICP-MS 测量

由于其地球化学性质相似，Ce 与其他稀土元素的分离尚未得到很好的确立。在这项研究中，我们报告了一种使用 Eichrom DGA 树脂从天然样品中纯化 Ce 的单级提取技术。该方法有效地将 Ce 与基质和干扰元素（如 Ba、La 和 Nd）分离。Ce 洗脱曲线不会随不同的 Ce 加载质量和岩石类型而漂移。使用 Thermo Scientific Neptune Plus 多接收器 (MC)-电感耦合等离子体 (ICP)-质谱 (MS) 仪器测量 Ce 同位素组成。Ce 同位素的仪器质量偏差通过样品标准括号法和 Sm 掺杂方法进行校正。δ ¹⁴²相对于美国国家标准与技术研究院 SRM 3110 测得的标准溶液（CDUT-Ce 和 JMC304）的 Ce 值分别为 +0.128 ± 0.028‰（2SD，N = 30）和 0.005 ± 0.038‰（2SD，N = 30） . δ ¹⁴² Ce的重现性优于0.040‰。本研究测量了 9 种美国地质调查局标准岩石的 Ce 同位素组成，包括碳酸岩、玄武岩、安山岩、石英拉长岩、辉绿岩、流纹岩和花岗闪长岩。我们的结果表明，δ ¹⁴²这些岩石的 Ce 值略有不同，表明在火成岩过程中发生了不显着的分馏。本研究提出的技术简单、省时，有利于进一步研究Ce同位素地球化学。

更新日期：2021-09-21

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