使用诱导合等离子体-双重质谱与臭氧诱导氧化作用来确定同位素
1National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
Analytical chemistry
|September 30, 2024
概括
这项研究引入了一种使用ICP-MS/MS.的新方法来确定 (Ca) 同位素. 通过使用臭氧作为反应气体,它克服了干扰,使得能够灵敏地检测Ca同位素.
科学领域:
- 分析化学 分析化学
- 同位素地球化学 同位素地球化学
- 质谱测量质量谱测量
背景情况:
- 使用 induktively coupled plasma-tandem mass spectrometry (ICP-MS/MS) 的 (Ca) 同位素分析受到 (Ar) 的同位素干扰的挑战.
- 最丰富的Ca同位素40Ca与ICP-MS中常见的载体气体Ar共享相同的质量,大大降低了检测灵敏度.
- 现有的方法在高Ar度的情况下难以准确量化Ca同位素.
研究的目的:
- 开发一种新的ICP-MS/MS方法,用于精确和灵敏地确定同位素.
- 为了减轻在40Ca测量过程中由Ar引起的光谱干扰.
- 为了使较少的Ca同位素 (Ca,Ca,Ca,Ca,Ca,Ca,Ca) 的检测具有高灵敏度.
主要方法:
- 使用感应合等离子体双重质谱法 (ICP-MS/MS) 进行Ca同位素分析.
- 引入臭氧 (O3) 作为碰撞细胞内的反应气体,以选择性地与离子反应.
- 通过量子化学计算 (密度函数理论) 研究了Ca+与O3和Ar+与O3的反应机制.
主要成果:
- Ca+与O的反应优先形成CaO3,有效地将Ca与Ar区分开来.
- 离子 (Ar+) 与O3反应形成ArO+,随后Ar+,而不是ArO3+,最大限度地减少了Ar的干扰.
- 开发的方法成功地检测出低丰度的Ca同位素 (Ca,Ca,Ca,Ca,Ca,Ca,Ca) 在具有高灵敏度的认证参考材料中.
结论:
- 建议使用臭氧的ICP-MS/MS方法有效地解决了Ca同位素确定中的Ar干扰问题.
- 这种技术显著提高了测量各种同位素的灵敏度和准确性.
- 该研究提供了一种强大的分析方法,用于在各种样本矩阵中精确量化Ca同位素.
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