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精确确定Cd同位素比在3-10 ng级别的热电离质谱学,使用化发射器
Chao-Feng Li1,2, Zhu-Yin Chu1,2, Peng Peng1,2
1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
Analytical chemistry
|September 10, 2024
概括
一个新的化 (MoSi2) 发射器提高了 (Cd) 电离效率,用于热电离质谱 (TIMS). 这一突破使得小样本 (3-10 ng) 的高精度Cd同位素比率分析成为可能.
科学领域:
- 地质化学 地质化学
- 分析化学 分析化学
- 同位素地球化学 同位素地球化学
背景情况:
- 使用双尖技术的热电离质谱 (TIMS) 为 (Cd) 同位素比率分析提供了高精度.
- 在TIMS中Cd的低电离效率限制了小样本 (<100 ng) 的高精度分析.
研究的目的:
- 开发一种使用高度敏感的发射器测量Cd同位素比率的新加载方法.
- 为了减少精确的Cd同位素分析所需的样本大小.
主要方法:
- 开发一种用于增强Cd电离的新型化 (MoSi2) 发射器.
- 应用108Cd-116Cd双尖方法用于Cd同位素比率测量.
- 对NIST SRM 3108和地质参考材料 (NIST SRM 2711a,NOD A-1,GBW08401) 的分析.
主要成果:
- MoSi2发射器显著提高了Cd电离效率,使得3-10 ng样本的分析成为可能.
- 在NIST SRM 3108中,对于 δ114/110Cd的±0.032‰至±0.051‰的优异可重复性 (2 SD) 在NIST SRM 3108中.
- 地质参考材料具有良好的外部可复制性,证明了方法的稳定性.
结论:
- 二氧化 (MoSi2) 是用于Cd同位素测量的传统凝的优质替代品.
- 新方法显著降低了精确Cd同位素分析所需的样本大小.
- 这一进步对于分析含有低Cd含量的地质样本尤为有价值.
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