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在小样本上高精度测量同位素的新方法

Guiqin Wang¹, Zhen Yang², Yuming Xu²

¹State Key Laboratory of Deep Earth Processes and Resources, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.

|August 24, 2025

概括

这项研究引入了一种用于精确分析小样本中的同位素的新方法, 这种改进的技术提高了地质和石研究的准确性.

科学领域:

地质化学
宇宙化学
同位素地化学

背景情况:

精确的 (W) 同位素测量对于Hf-W计时器至关重要,
传统的高精度W同位素分析需要大样本,限制对小样本或低W含量的研究.
之前的方法在准确确定氧 (O) 同位素组成方面遇到了挑战,影响了W同位素比率的精度.

研究的目的:

为小样本开发一种W净化方法,使用最小的过程空白和高回收率.
建立使用负热离子质谱 (NTIMS) 的微量W同位素高精度测量方法.
通过开发高精度的O同位素组成测量方法来提高W同位素测量的准确性和精度.

主要方法:

针对小样本 (< 40 pg空白, > 97%回收) 优化了两列W净化方案.
使用静态法拉第杯和专用放大器进行高精度W同位素测量,W数量>30 ng.
为了提高W同位素的精度,采用了一种测量O同位素组成的新方法ReO4.

主要成果:

开发的W净化方法对小样本有效.
对于>30 ng W的182W/184W比率的长期可重复性被确定为0.864868±6 ppm (2 RSD).
该方案已成功应用于陆地岩石和石 (20-400毫克样本),证明了其广泛适用性.

结论:

新的协议显著减少了W分离背景,并提高了小样本的W同位素测量精度.
这项研究克服了O同位素测定方面的先前局限性,解决了W同位素比例的不确定性.
该方法为精确的W同位素分析提供了强大的工具,推进了行星形成和进化的研究.

关键词:

染色学方法高精度测量小型样本时间 W同位素

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