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在天然海水中通过同位素稀释和大体积注射使用PTV-GC-ICP-MS进行物种化的敏感分析

Esther S Breuninger¹, Julie Tolu¹, Sylvain Bouchet¹

¹Institute of Biogeochemistry & Pollutant Dynamics, Dept. of Environmental Sciences, Swiss Federal Institute of Technology (ETHZ), Universitätstrasse 16, 8092, Zurich, Switzerland; Department Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science & Technology (Eawag), Überlandstrasse 133, 8600, Dübendorf, Switzerland.

Analytica chimica acta

|October 12, 2023

概括

研究人员开发了一种敏感的方法来测量海水中的 (Se) 形式. 这一突破允许精确量化化,酸和海洋环境中的有机,进步我们对全球循环的理解.

科学领域:

环境化学环境化学
海洋地球化学海洋地球化学
分析化学分析化学

背景情况:

海洋对全球 (Se) 循环至关重要,但关于Se分布和物种化的定量数据仍然很少.
由于度极低和干扰矩阵元素,分析海水中的Se具有挑战性.

研究的目的:

建立一种敏感的分析方法,用于确定天然海水中的各种化学分数.
为了量化化 (SeIV),化 (SeVI),有机Se-II + Se0和总Se度.

主要方法:

特定物种的同位素稀释气体染色学与诱导合等离子体质谱学 (ID-GC-ICP-MS) 相结合.
优化了预处理协议,包括微波辅助氧化和衍生试剂.
在线预度使用大体积注射 (LVI) 与编程温度蒸发 (PTV) 输入以提高灵敏度.

主要成果:

实现了不同Se分数的低绝对 (0.1-0.3 pg) 和方法 (0.9-3.1 ng/L) 检测极限.
使用经过认证的参考材料,证明了高精度 (2%) 和精度 (<4%).
在波罗的海和北海的水样中,成功量化了各种分数,其度范围广泛.

结论:

开发的方法具有足够的灵敏度,可以在盐和海洋系统中量化总Se,SeIV,SeVI和有机Se-II + Se0.
这项工作为了解海洋循环提供了关键的定量数据.
该方法在低度,高矩阵环境中克服了重大分析挑战.

关键词:

水生生态系统水生生态系统衍生产制衍生产制衍生产制气体染色学是一种气体染色学.同位素稀释的同位素稀释质谱测量质量谱测量的物种化的物种化

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