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通过双尖MC-ICP-MS对各种样品进行高精度同位素分析的高效Cd分离协议

Yihang Huang¹, Zijian Jia¹, Hui Xu¹

¹Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK.

|December 6, 2024

概括

新的 (Cd) 分离技术改善了对各种样品的同位素分析,包括石和海水. 这些高效的方法确保了高回收率和低空白率,使得行星和环境科学研究能够进行精确的测量.

科学领域:

行星科学行星科学
地球科学地球科学地球科学
环境科学环境科学
生命科学生命科学

背景情况:

同位素分析对于行星,地球,环境和生命科学至关重要.
目前用于从多种样本矩阵中分离微量 (Cd) 的现有方法对于同位素分析是低效的.
需要改进Cd分离技术,以促进准确的同位素测量.

研究的目的:

开发和推出新的,高效的Cd分离和净化技术.
为了能够精确地测量石,陆地和海水样本中的Cd同位素,使用多个采集器ICP-MS与双峰校正.
克服现有的Cd分离协议对同位素分析的局限性.

主要方法:

使用AG MP-1M,AG 1-X8和Nobias Chelate PA-1树脂的离子交换色谱进行初始Cd分离.
用Teflon微柱和AG MP-1M树脂用于所有样品类型的Cd净化.
在多个采集器ICP-MS测量中应用双尖方法进行质量偏差校正.

主要成果:

从矩阵元素中有效地分离了Cd,回收率很高 (>95%的石/陆地,>80%的海水).
保持低的程序空白 (<0.08 ng) 和证明高精度 (2SD <±0.07 ‰) 的 δ114Cd测量.
成功分析了多种样本,包括石 (Murchison,GRO 95504) 和海水,取得与先前研究一致的结果.

结论:

新的Cd分离和净化方法对于广泛的样品类型是高效和有效的.
这些协议使得无偏见和精确的δ114Cd测量成为可能,即使样本数量有限 (≤10 ng Cd).
开发的技术促进了同位素地球化学在各种科学领域的应用.

关键词:

的同位素是的同位素.离子交换色谱学离子交换色谱学石石这些石头石头石头海水是海水,海水是海水.土壤土壤土壤.

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