独立于矩阵和不受干扰的in situ同位素分析通过激光消光MC-ICP-MS/MS
Christopher D Standish1, J Andy Milton1, Rachel M Brown1,2
1School of Ocean & Earth Sciences, University of Southampton, National Oceanography Centre European Way Southampton SO14 3ZH UK c.d.standish@soton.ac.uk.
Journal of analytical atomic spectrometry
|April 14, 2025
概括
这项研究引入了Neoma MS/MS质谱仪,用于准确的局部同位素分析. 它克服了由矩阵引起的偏差和干扰,使精确的地质材料分析成为可能.
科学领域:
- 地质化学 地质化学
- 分析化学 分析化学
- 质谱测量质量谱测量
背景情况:
- 传统的激光除多采集器感应合等离子体质谱 (LA-MC-ICP-MS) 用于同位素分析面临着挑战.
- 矩阵和质量负载诱导的偏差,以及分散的离子干扰,损害了准确性,特别是与非矩阵匹配的参考材料.
研究的目的:
- 为了评估Thermo Scientific Neoma MS/MS质谱仪在现场进行同位素分析.
- 评估其克服以前LA-MC-ICP-MS技术局限性的能力.
主要方法:
- 使用Neoma MS/MS系统,具有细胞前质量过和碰撞/反应细胞.
- 使用NIST SRM612玻璃进行括号分析以实现质量偏差正常化.
- 分析了14种不同度的基准材料 (碳酸盐和酸盐).
主要成果:
- 细胞前质量过器有效消除了分散的离子干扰.
- 通过优化激光参数和限制废弃材料来防止矩阵和质量负载诱导的偏差.
- 对参考材料的分析结果在确定的值的不确定性范围内.
- 在具有足够的信号强度的情况下,可以实现高精度 (1‰以上).
结论:
- 尼奥马MS/MS系统为地质材料提供了准确而精确的,独立于矩阵的 in situ 同位素分析.
- 与之前的LA-MC-ICP-MS方法相比,它是一个显著的进步.
- 该仪器的功能为需要高准确度同位素数据的地质研究开辟了新的途径.
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