<br>连续流-双吹扫捕集法预富集大量海水中的汞以进行稳定同位素分析,Analytical Chemistry

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连续流-双吹扫捕集法预富集大量海水中的汞以进行稳定同位素分析
Analytical Chemistry ( IF 6.7 ) Pub Date : 2024-02-07 , DOI: 10.1021/acs.analchem.3c01657
Meijiao He ₁ , Supeng Lv ₁ , Runsheng Yin ₂ , Yuanbiao Zhang ₁ , Kunning Lin ₁ , Sainan Wang ₃ , Huige Guo ₁ , Hongzhe Chen ₁ , Shuyuan Huang ₁

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汞 (Hg) 同位素为了解环境中汞的来源和过程提供了有用的工具。由于缺乏处理大量低汞浓度海水样品的有效方法，海水的汞同位素组成仍然受到很少的限制。在这里，我们开发了一种连续流双吹扫捕集装置，用于原位富集海水中的汞。该方法对加标海水样品产生了 91.7 ± 3.3% ( n = 4, 1SD) 的良好汞回收率，并给出了与 NIST 8610 相当相似的汞同位素比，表明海水处理过程中有限的基质效应和有限的汞同位素分馏。 NIST 8610 δ ²⁰² Hg (−0.55 ± 0.09 ‰, n = 4, 1SD) 和 Δ ¹⁹⁹ Hg (0.07 ± 0.02 ‰, n = 4, 1SD) 与之前发布的数据相似。该方法已成功应用于从厦门湾和南海收集的海水。海水样品的汞回收率为 91.6 ± 5.4% ( n = 12, 1SD)。厦门湾海水 Δ ¹⁹⁹ Hg (−0.04 ± 0.05 ‰, n = 7, 1SD) 与南海海水 Δ ¹⁹⁹ Hg (0.05 ± 0.07 ‰, n = 5, 1SD) 不同，这意味着不同的 Hg来源来自沿海和公海地区，并强调了我们的方法在了解海水汞同位素组成方面的稳健性。

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Continuous Flow–Double Purge and Trap Method for Preconcentrating Mercury in Large Volumes of Seawater for Stable Isotope Analysis

Mercury (Hg) isotopes provide a useful tool to understand Hg sources and processes in the environment. The Hg isotopic composition of seawater remains poorly constrained due to the lack of an efficient method to process large volumes of low-Hg-concentration seawater samples. Here, we develop a continuous flow–double purge and trap device for the in situ preconcentration of Hg in seawater. This method yielded a good Hg recovery of 91.7 ± 3.3% (n = 4, 1SD) for spiked seawater samples and gave reasonably similar Hg isotope ratios of NIST 8610, indicating a limited matrix effect and limited Hg isotope fractionation during processing of seawater. NIST 8610 δ²⁰²Hg (−0.55 ± 0.09‰, n = 4, 1SD) and Δ¹⁹⁹Hg (0.07 ± 0.02‰, n = 4, 1SD) were similar to previously published data. The method was successfully applied to seawater collected from the Xiamen Bay and the South China Sea. The seawater samples showed a Hg recovery of 91.6 ± 5.4% (n = 12, 1SD). Seawater Δ¹⁹⁹Hg (−0.04 ± 0.05‰, n = 7, 1SD) in the Xiamen Bay was different from seawater Δ¹⁹⁹Hg (0.05 ± 0.07‰, n = 5, 1SD) in the South China Sea, which implies distinct Hg sources to coastal and open ocean areas and highlights the robustness of our method in understanding the Hg isotopic composition of seawater.

更新日期：2024-02-07

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