天然有机质介导的汞生物地球化学循环:结合作用与分子转化

Role of Natural Organic Matter in the Biogeochemical Cycle of Mercury:Binding and Molecular Transformation

汞具有持久性、生物积累性及长距离传输特性,是一类重要的全球污染物。在陆地、湖泊、海洋等环境中,天然有机质是汞的重要络合配体,对汞的生物地球化学循环有重要作用,可显著影响汞的迁移、分布、生物累积与毒性。此外,天然有机质在硫化汞的分散及汞的分子转化如还原、氧化、甲基化、甲基汞的去甲基化中起着至关重要的作用。本文对天然有机质与汞的结合与分子转化的研究进展进行了总结,并提出了后续研究的重点。

Mercury is an important global pollutant, with the characteristics of persistence, bioaccumulation and long-distance transport. In the terrestrial, lakes and marine environment, natural organic matter （NOM） is important binding ligand for divalent inorganic mercury and methylmercury, which plays important roles in the biogeochemical cycling of mercury, including migration, distribution, bioaccumulation and toxicity. In addition, NOM plays crucial roles in the dispersion of HgS and molecular transformation of mercury and methylmercury, including reduction, oxidation, methylation of inorganic mercury and demethylation of methylmercury. The research progress on the binding of mercury with NOM and its roles in the transformation of mercury is reviewed and future prospects in this field are discussed.