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通过MC-ICP-MS确定来自中国的20种土壤参考材料的高精度同位素表征

Hua-Ye Zhai¹, Xuan-Ce Wang^1,2, Chao-Feng Li³

¹Yunnan University Kunming 650504 China x.wang4@uq.edu.au.

|June 30, 2023

概括

这项研究引入了一种用于精确测量土壤中 (Zn) 同位素的新方法. 这些发现为中国土壤确定了基线Zn同位素值,这对于跟踪金属循环至关重要.

科学领域:

地质化学地质化学
环境科学环境科学
分析化学分析化学

背景情况:

(Zn) 的同位素比例对于理解金属在土壤中的生态化学循环至关重要.
对同位素的高精度测量需要可靠的土壤参考材料 (RMs).
关于土壤RM的高精度Zn同位素数据的先前报告是有限的.

研究的目的:

开发和验证精确的化学分离协议,用于在土壤参考材料 (RMs) 中进行 (Zn) 同位素分析.
首次报告20种不同中国土壤RMS的Zn同位素组成.
建立基线Zn同位素数据,用于实验室间比较和土壤研究.

主要方法:

开发了一种使用Bio-Rad AG MP-1M树脂柱的两步化学分离协议.
外部δ值测定时具有很高的可重现性 (优于0.06‰,2SD).
分析了来自中国各种土壤类型的20种土壤参考材料.

主要成果:

开发的方法实现了 Zn 同位素测量的优良可重现性.
这项研究报告了20个中国土壤RM的第一个高精度Zn同位素组成.
大多数土壤RM都显示出类似的Zn同位素组成 (平均Zn为0.31±0.12‰),与火性岩石一致,除了受采矿影响的样本.

结论:

新的协议为土壤中高精度Zn同位素分析提供了一种可靠的方法.
报告中关于中国土壤RM的Zn同位素数据可以作为未来研究的宝贵参考.
同位素值的偏差可以表明特定的土壤过程,例如采矿活动造成的污染.

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