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三种预缩树脂之间的比较,以确定天然水中的溶解,使用同位素稀释和高分辨率的感应合等离子体质谱法

Zheng Bo Liu¹, Jing Zhang², Shuo Jiang¹

¹State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China.

|June 24, 2023

概括

一种新方法使用树脂丰富和同位素稀释精确测量在自然水中溶解的 (Ga). 普雷塞普®聚烯酸树脂在提取Ga方面表现优越,特别是在低pH值下,使得精确的度确定.

科学领域:

环境化学环境化学
分析化学分析化学
地质化学地质化学

背景情况:

(Ga) 是天然水中的重要微量元素.
准确确定溶解的Ga度对于环境和地质化学研究至关重要.
现有的Ga分析方法在灵敏度或矩阵干扰方面可能存在局限性.

研究的目的:

开发和验证一种新的,准确的方法来确定自然水中的溶解 (Ga) 度.
为了比较不同树脂的Ga提取效率.
为确定Ga.的同位素稀释分析的最佳条件.

主要方法:

使用Chelex-100,Nobias Chelate PA-1和Presep® PolyChelate树脂进行树脂丰富.
树脂属性的比较,包括pH值范围,矩阵去除,提取/脱离时间和容量.
为Ga测量优化同位素稀释条件.
对程序空白和校准样本的分析.

主要成果:

与Chelex-100相比,Presep® PolyChelate树脂在Ga提取方面表现优越,效率与Nobias Chelate PA-1相比,但具有更广泛的最佳pH范围.
开发的方法实现了低程序空白 (0.42 ± 0.18 pmol/kg) 和0.6 pmol/kg的检测极限.
准确的Ga度在各种自然水中确定,包括海水和河水,与现有数据一致. 雨水显示了极低的Ga度.

结论:

开发的树脂丰富和同位素稀释方法提供了在自然水中溶解的Ga的准确可靠的测量.
对于高效的Ga提取,特别是在酸性条件下,推使用Presep® PolyChelate树脂.
该方法适用于分析各种水矩阵,并有助于更好地了解Ga的生物地质化学.

关键词:

溶解的 Ga 是一种在ICP-MS中,使用的是ICP-MS.同位素稀释的同位素稀释天然水是天然的水.树脂树脂是一种树脂.

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