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通过MC-ICP-MS对低Mo碳酸盐进行高精度同位素分析的新型HF预富方法

Yan Han¹, Lian Zhou¹, Anping Hu²

¹State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China.

Analytica chimica acta

|September 29, 2025

概括

这项研究引入了一种新的,高效的方法来分析碳酸盐中的 (Mo) 同位素. 这一进步改善了利用这些关键的古老环境痕迹来重建过去的海洋大气条件.

科学领域:

地质化学地质化学
古海洋学是古海洋学.
同位素地球化学同位素地球化学

背景情况:

碳酸盐中的 (Mo) 同位素对于重建过去的海洋大气条件至关重要.
由于低度和矩阵效应,分析碳酸盐中的Mo同位素是很困难的.
现有的方法耗时,样本处理能力有限.

研究的目的:

为碳酸盐样品开发一个简化和高效的Mo预丰富协议.
为了在具有挑战性的低Mo碳酸盐矩阵中实现高精度的Mo同位素比率测量.
为研究古老环境条件提供一个强大的框架.

主要方法:

一个新的酸 (HF) 前缩步骤可以去除97%以上的主要矩阵元素.
一个单阶段的DGA树脂分离有效地消除了剩余的矩阵组件.
使用MC-ICP-MS测量Mo同位素比率,使用双尖和标准样品括号 (SSB) 技术.

主要成果:

新协议实现了低程序空白值 (<100 pg Mo),适用于大样本大小 (>10 ng Mo).
使用合成溶液和参考材料的验证显示出与已发表的数据有很好的一致性.
报告了七种碳酸盐参考材料的第一个全面的Mo同位素数据.

结论:

开发的协议为低Mo碳酸盐中Mo同位素分析提供了简化和强大的分析框架.
这种方法提高了古环境重建的效率和可靠性.
它有助于对古代海洋-大气系统进行更准确的调查.

关键词:

一个HF预富方法.同位素分析分析.合金是一种合金.超低碳酸盐的使用方法

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