水环境中铁-汞耦合对汞生物地球化学循环的影响研究进展
Influence of iron-mercury coupling on biogeochemical cycle of mercury in aquatic environment: A review of recent studies
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摘要: 汞及其化合物是一类重要的全球污染物.水环境是汞重要的汇,也是汞发生形态转化与生物富集的重要场所.水环境中铁-汞相互作用对汞的生物地球化学循环有重要的影响.本文围绕水环境中铁-汞生物地球化学循环的耦合,讨论并总结了含铁矿物对汞的吸附、硫铁矿物对汞的硫化、溶解性铁与含铁矿物对二价汞的还原、铁对汞微生物甲基化的影响、铁参与的甲基汞降解、铁硫矿物介导二甲基汞生成以及水稻根系铁膜对汞吸收的影响,并进一步对铁-汞耦合对汞的生物地球化学循环影响的未来研究重点进行了展望.Abstract: Mercury and its compounds are a class of important global pollutants. Aquatic environment is an important sink for mercury and also crucial sites for its transformation and bioaccumulation. The interaction of iron and mercury in aquatic environment has important impacts on the biogeochemical cycle of mercury. This review focused on the coupling of biogeochemical cycles of iron and mercury in aquatic environment, and discussed and summarized the adsorption of mercury to iron minerals, sulfidation of mercury by iron sulfide, reduction of mercury by dissolved iron and iron minerals, effect of iron on the microbial methylation of mercury, degradation of methylmercury by iron, formation of dimethylmercury induced by iron sulfide, as well as effect of iron plaque on the uptake of mercury. The future trends in iron-mercury coupling on biogeochemical cycle of mercury in aquatic environment was also proposed.
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Key words:
- mercury /
- methylmercury /
- iron /
- biogeochemical cycle /
- aquatic environment
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