δ(18O/16O) 在水中使用感应合等离子体-双重质谱法进行测定
Shaun T Lancaster1, Johanna Irrgeher1,2, Remi Dallmayr3
1Department of General, Analytical and Physical Chemistry, Chair of General and Analytical Chemistry, Montanuniversität Leoben, 8700 Leoben, Austria.
Analytical chemistry
|September 16, 2025
概括
一种新方法使用诱导合的等离子体双重质谱法 (ICP-MS/MS) 与来准确测量水中的氧同位素比率. 这种方法克服了干扰,使其在环境和地质研究中具有更广泛的应用.
科学领域:
- 分析化学 分析化学
- 环境科学 环境科学
- 地质化学 地质化学
背景情况:
- 精确确定水中的氧同位素比例 (17O/16O和18O/16O) 对各种科学学科至关重要.
- 传统方法在质谱学中面临着多原子干扰的挑战.
- 感应合的等离子体-双重质谱 (ICP-MS/MS) 为改善同位素分析提供了潜力.
研究的目的:
- 开发和验证一种新的ICP-MS/MS方法,用于确定水中的氧同位素比率.
- 解决和克服影响17O和18O测量的多原子干扰.
- 评估方法的性能与既定技术和参考材料相比.
主要方法:
- 使用ICP-MS/MS与 (D2) 作为反应气体,将氧同位素转换为OD3+离子.
- 采用质量转移策略来消除干扰的多原子离子 (16OH+,16OH2+).
- 使用国际原子能机构的参考材料和内部标准验证了该方法,并通过同位素比质谱学和腔环降光谱学进行分析.
主要成果:
- 成功开发并验证了一种完全功能化的ICP-MS/MS方法,用于测量水中的氧同位素比率.
- 证明有效地消除了多原子干扰,使得精确的δ18O/16O测定成为可能.
- 观察到的矩阵效应 (Na,Cl,Si) 导致高达12‰的移位;方法显示了对δ17O/16O分析的潜力.
- 达到了0.70‰的 δ18O/16O 的中位数不确定性,与低矩阵样本的参考方法相比.
结论:
- 开发的ICP-MS/MS方法为在水中的氧同位素比率分析提供了经过验证的方法.
- 虽然目前的不确定性高于一些参考方法,但该技术适用于不需要超低不确定性的应用.
- 该方法允许同时进行氧同位素和多元素分析,扩大其在不同研究领域的实用性.
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