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通过MC-ICP-MS在子纳米克的同位素组成的高精度测量与膜溶解

Mao-Yong He^1,2, Li Deng¹, Jianni Liu³

¹State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences Xi'an 710061 China hemy@ieecas.cn.

|November 3, 2023

概括

精确的同位素分析现在可以用于地质样本,即使是那些含量超低的样本. 这种新方法使用多采集器感应合等离子体质谱仪进行精确的地化学研究.

科学领域:

地质化学地质化学
同位素地球化学同位素地球化学
分析化学分析化学

背景情况:

(Li) 和它的同位素是化学气候变化的关键标记物.
精确的同位素测定在复杂的地质样本中具有挑战性,具有不同的度和矩阵.
珍贵的地质样本通常具有超低含量和高矩阵干扰.

研究的目的:

评估低水平地质样本中同位素测量的准确性和精度.
评估多采集器感应合等离子体质谱仪 (MC-ICP-MS) 与膜溶解引入系统的性能,用于同位素分析.
为了验证一种用于微量的高精度同位素分析的方法.

主要方法:

采用了多采集器感应合等离子体质谱法 (MC-ICP-MS).
采用了膜溶解引入系统和高灵敏度X-skimmer圆.
整合了一个简单的单步列分离技术.
分析了国际参考材料 (BHVO-2,AGV-2,NASS-6) 和各种地质样本 (海水,石,石灰岩,雨水).

主要成果:

实现了高精度的同位素分析,的含量低至2纳米克.
对于δ7Li值的长期仪器外部可复制性已经证明 (例如,L-SVEC:0.0 ± 0.1‰,SPEX-Li:12.1 ± 0.4‰).
获得的参考材料的结果与已公布的数据一致,在不确定性范围内.
成功分析了各种样本类型,包括海水,石,石灰岩和雨水.

结论:

开发的MC-ICP-MS方法与膜溶解提供准确和精确的同位素测量低水平样本.
这种技术对于分析具有挑战性的矩阵和超低度的宝贵地质样本是有效的.
经过验证的方法支持化学气候变化过程的先进地化学研究.

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