开发低压He-MC-MIP-MS及其用于氧气同位素分析的应用
Jie Lin1, Zhenyi Liu1, Yongsheng Liu1
1State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China.
Analytical chemistry
|November 1, 2023
概括
这项研究引入了一种使用低压微波诱导等离子体与多采集器质谱学 (He-MC-MIP-MS) 结合使用的新方法,用于精确的元素分析. 这种技术克服了传统方法的局限性,使难以测量同位素的精确测量成为可能.
科学领域:
- 分析化学 分析化学
- 同位素比重质谱法 质谱法 质谱法
- 等离子体物理学的物理学
背景情况:
- 基于的感应合等离子体质谱 (ICP-MS) 面临着与Ar相关的干扰和低电离效率的挑战.
- 由于这些限制,某些元素,特别是非金属的精确确定受到阻碍.
研究的目的:
- 开发一个改进的等离子体源用于质谱.
- 提高电离能力,减少干扰,以便进行准确的同位素分析.
- 研究微波诱导等离子体 (MIP) 的应用,使用 (He) 作为工作气体.
主要方法:
- 使用微波诱导等离子 (MIP) 离子源与多采集器质谱仪 (MC-MS) 装置相连.
- 采用 (He) 作为工作气体,以提高电离能力.
- 使用真空以低压 (200-300 Pa) 操作接口,以最大限度地减少大气干扰.
主要成果:
- 使用低压He-MIP实现了显著改善的氧气电离.
- 通过低压等离子体操作消除大气氧干扰.
- 在使用MC-MS的氧同位素测定中,证明了更高的精度,在0.16‰ (2 SD) 的长期生产率为 δ18O.
结论:
- 低压He-MC-MIP-MS为准确确定非金属和易受干扰的同位素提供了可行的解决方案.
- 这种方法克服了基于Ar的ICP-MS的局限性.
- 在各种科学领域为更精确的同位素测量铺平了道路.
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