Occurrence of Mercurous [Hg(I)] Species in Environmental Solid Matrices as Probed by Mild 2-Mercaptoethanol Extraction and HPLC-ICP-MS Analysis,Environmental Science & Technology Letters

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Occurrence of Mercurous [Hg(I)] Species in Environmental Solid Matrices as Probed by Mild 2-Mercaptoethanol Extraction and HPLC-ICP-MS Analysis
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-06-03 , DOI: 10.1021/acs.estlett.0c00329
Ying Wang _{1,

2,

3} , Guangliang Liu ₄ , Yanbin Li ₅ , Yanwei Liu _{1,

2} , Yingying Guo _{1,

2} , Jianbo Shi ₂ , Ligang Hu ₂ , Yong Cai _{1,

2,

6} , Yongguang Yin _{1,

2,

3,

4} , Guibin Jiang ₂

Affiliation

Mercurous Hg [Hg(I)] is, from the perspective of chemistry, an inevitable intermediate in Hg(II)/Hg(0) redox, presumably playing a critical role in the environmental transformation of common toxic Hg species, such as Hg(II), Hg(0), and methylmercury. The occurrence of Hg(I) in the environment, however, has been scarcely documented, due to its instability, which greatly limits its isolation and identification. We probed the occurrence of Hg(I) in various environmental solid matrices by developing and employing a method based on mild 2-mercaptoethanol extraction and HPLC-ICP-MS analysis. Various complexation agents and assisted extraction methods were investigated for their effects on Hg(I) stability. A variety of solid matrices were used to demonstrate extraction, separation, and detection of Hg(I) under optimized conditions. The occurrence of Hg(I) was widely evident in various solid matrices, including desulfurized gypsum, fly ash, phosphorus powder in used fluorescent lamps, PM_2.5, soil, and plants, despite Hg(I) reduction possibly being catalyzed by a solid matrix during extraction that could underestimate Hg(I) in the samples. More importantly, Hg(I) was detected in Hg(II)-exposed microalgae, exemplifying the environmental relevance of Hg(II) to Hg(I) transformation. These findings highlight the environmental significance of Hg(I), which should be further studied to examine the role of Hg(I) in the transformation, bioavailability, and toxicity of Hg.

中文翻译：

温和的2-巯基乙醇萃取和HPLC-ICP-MS分析表明环境中固体中汞[Hg（I）]的存在

从化学的角度来看，汞[Hg（I）]是Hg（II）/ Hg（0）氧化还原中不可避免的中间体，据推测在常见有毒Hg物种（如Hg（ II），Hg（0）和甲基汞。但是，由于环境中Hg（I）的不稳定性，因此很少记录在案，这极大地限制了Hg（I）的分离和鉴定。我们通过开发和采用基于温和的2-巯基乙醇萃取和HPLC-ICP-MS分析的方法，探讨了各种环境固体基质中Hg（I）的存在。研究了各种络合剂和辅助提取方法对Hg（I）稳定性的影响。在优化的条件下，使用各种固体基质来演示Hg（I）的提取，分离和检测。_2.5，土壤和植物，尽管萃取过程中可能由固体基质催化Hg（I）的还原，这可能会低估样品中的Hg（I）。更重要的是，在暴露于Hg（II）的微藻中检测到Hg（I），证明了Hg（II）与Hg（I）转化的环境相关性。这些发现突出了Hg（I）的环境意义，应进一步研究以检查Hg（I）在Hg的转化，生物利用度和毒性中的作用。

更新日期：2020-07-14

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