Low-blank method for the offline batch analysis of the low concentration of dissolved lead in natural waters and its application to natural waters, including the tropical Northwest Pacific Ocean

IF 3 3区地球科学 Q2 CHEMISTRY, MULTIDISCIPLINARY Marine Chemistry Pub Date : 2024-03-01 DOI:10.1016/j.marchem.2024.104374

Shuo Jiang , Jing Zhang , Zheng Bo Liu , Han Su

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Abstract

In this study, Presep® PolyChelate resin was utilized for the offline batch extraction process and then combined with the isotope dilution method for the analysis of low concentrations of dissolved lead (Pb) in freshwater and seawater. The application of Presep® PolyChelate resin further lowered the procedural blank by reducing the amount of resin beads and buffer solution that were added with an 8-fold preconcentration. The adsorption and elution times were shortened to 2 d and 30 min, respectively, and > 85% recovery was achieved. The total procedural blank and detection limit were 0.2 ± 0.1 pmol/kg and 0.2 pmol/kg, respectively. The accuracy of this method was also verified using GEOTRACES intercalibration SAFe seawaters, with concentrations of 48.0 ± 0.5 pmol/kg (n = 3) and 27.0 ± 0.7 pmol/kg (n = 3) observed for SAFE S and D2, respectively. Full-depth profiles of dissolved Pb concentrations collected during the 2016 tropical Northwest Pacific Ocean cruise were analyzed. The dissolved Pb concentration increased from 30 pmol/kg at the surface to 50 pmol/kg at the subsurface and it then decreased to 8–9 pmol/kg in the bottom waters.

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用于离线批量分析自然水体中低浓度溶解铅的低空白方法及其在西北太平洋热带等自然水体中的应用

本研究利用 Presep® PolyChelate 树脂进行离线批量萃取，然后结合同位素稀释法分析淡水和海水中的低浓度溶解铅（Pb）。Presep® PolyChelate 树脂的应用减少了树脂珠和缓冲溶液的添加量，从而进一步降低了程序空白，预浓缩倍数为 8 倍。吸附和洗脱时间分别缩短至 2 天和 30 分钟，回收率达到 85%。程序空白和检出限分别为 0.2 ± 0.1 pmol/kg 和 0.2 pmol/kg。使用 GEOTRACES 互校 SAFE 海水也验证了该方法的准确性，SAFE S 和 D2 海水的浓度分别为 48.0 ± 0.5 pmol/kg（n = 3）和 27.0 ± 0.7 pmol/kg（n = 3）。对 2016 年西北太平洋热带巡航期间收集的溶解铅浓度全深度剖面图进行了分析。溶解铅浓度从表层的 30 pmol/kg 增至次表层的 50 pmol/kg，然后在底层水域降至 8-9 pmol/kg。

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来源期刊

Marine Chemistry 化学-海洋学

CiteScore

6.00

自引率

3.30%

发文量

审稿时长

4.5 months

期刊介绍： Marine Chemistry is an international medium for the publication of original studies and occasional reviews in the field of chemistry in the marine environment, with emphasis on the dynamic approach. The journal endeavours to cover all aspects, from chemical processes to theoretical and experimental work, and, by providing a central channel of communication, to speed the flow of information in this relatively new and rapidly expanding discipline.