高精度,依赖质量的Si同位素测量通过关键混合物双技术
Xiao-Ning Liu1, Martijn Klaver1, Remco C Hin2
1Bristol Isotope Group, School of Earth Science, University of Bristol Bristol BS8 1RJ UK xiaoning.liu@bristol.ac.uk.
Journal of analytical atomic spectrometry
|September 16, 2024
概括
一种新的关键混合物双方法精确地测量了 (Si) 同位素分离. 这种技术的长期可重复性比传统地质材料的方法高2至8倍.
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:
- 精确测量依赖质量的 (Si) 同位素分离对于理解地质过程至关重要.
- 传统的Si同位素测量方法在长期复制性方面存在局限性,阻碍了精确的地化学研究.
- 关键混合物双技术为同位素分析中提高精度提供了潜在的途径.
研究的目的:
- 开发和验证一种用于测量依赖质量的Si同位素分离的新方法,使用关键混合物双.
- 与现有技术相比,评估新方法的精度和可重复性.
- 使用开发的方法来描述国际地质参考材料.
主要方法:
- 开发了一种使用29Si-30Si尖的关键混合物双尖技术.
- 在列化学之前,样品被代增,以确保完全平衡.
- 分析使用了双通旋风石英喷雾室和6μg ml-1Si溶液,以获得高的信号噪声比.
主要成果:
- 这种新方法的典型精度为±0.03‰ (2秒距离). 对于 δ30/28Si. 的情况.
- 酸盐参考材料BHVO-2在16个月的长期可再生性为±0.03‰ (2秒. ),性能比传统方法高2至8倍.
- 地质参考材料 (BHVO-2,BIR-1,JP-1) 和藻石的表征结果与文献一致,但精度明显更高.
结论:
- 关键混合物双技术为测量Si同位素分离提供了一个高度精确和可重复的方法.
- 这一进步使得需要精确的Si同位素数据的地化学研究更加精确.
- 该方法的卓越可重复性使其适用于地质样本的常规分析.
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