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Mercury sources, transport, and transformation in rainfall-runoff processes: Mercury isotope approach
Water Research ( IF 11.4 ) Pub Date : 2024-07-04 , DOI: 10.1016/j.watres.2024.122044 Ruolan Li 1 , Junyao Yan 1 , Chuan Wang 1 , Shaochen Yang 2 , Lin Zhang 3 , Tao Peng 3 , Wei Zhu 4 , Ping Li 2 , Leiming Zhang 5 , Xinbin Feng 1
Water Research ( IF 11.4 ) Pub Date : 2024-07-04 , DOI: 10.1016/j.watres.2024.122044 Ruolan Li 1 , Junyao Yan 1 , Chuan Wang 1 , Shaochen Yang 2 , Lin Zhang 3 , Tao Peng 3 , Wei Zhu 4 , Ping Li 2 , Leiming Zhang 5 , Xinbin Feng 1
Affiliation
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Mercury (Hg) in runoff water poses significant ecological risks to aquatic ecosystems that can affect organisms. However, accurately identifying the sources and transformation processes of Hg in runoff water is challenging due to complex natural conditions. This study provides a comprehensive investigation of Hg dynamics in water from rainfall to runoff. The Hg isotope fractionation in water was characterized, which allows accurate quantification of Hg sources, transport, and transformations in rainfall-runoff processes. Δ200 Hg and corrected Δ199 Hg values can serve as reliable tracers for identifying Hg sources in the runoff water and the variation of δ202 Hg can be explained by Hg transformation processes. During runoff migration processes, Hg from rainfall is rapidly absorbed on the land surface, while terrestrial Hg entering the water by the dissolution process becomes the primary component of dissolved mercury (DHg). Besides the dissolution and adsorption, microbial Hg(II) reduction and demethylation of MeHg were dominant processes for DHg in the runoff water that flows through the rice paddies, while photochemical Hg(II) reduction was the dominant process for DHg in the runoff water with low water exchange rates. Particulate Hg (PHg) in runoff water is dominantly originated by the terrestrial material and derived from the dissolution and adsorption process. Tracking sources and transformations of Hg in runoff water during the rainfall-runoff process provides a basis for studying Hg pollution in larger water bodies under complex environmental factors.
中文翻译：
降雨径流过程中的汞来源、迁移和转化：汞同位素方法
径流水中的汞 (Hg) 对水生生态系统构成重大生态风险，可能影响生物体。然而，由于自然条件复杂，准确识别径流水中汞的来源和转化过程具有挑战性。这项研究对从降雨到径流的水中汞动态进行了全面的调查。对水中的汞同位素分馏进行了表征，从而可以准确量化汞的来源、迁移和降雨径流过程中的转化。 Δ200Hg和校正的Δ199Hg值可以作为识别径流水中汞源的可靠示踪剂，δ202Hg的变化可以通过汞转化过程来解释。在径流迁移过程中，降雨中的汞被陆地表面迅速吸收，而陆地汞通过溶解过程进入水中，成为溶解汞（DHg）的主要成分。除溶解和吸附外，微生物 Hg(II) 还原和 MeHg 去甲基化是流经稻田径流水中 DHg 的主要过程，而光化学 Hg(II) 还原是流经稻田径流水中 DHg 的主要过程。水交换率低。径流水中的颗粒汞 (PHg) 主要源自陆地物质，源自溶解和吸附过程。追踪降雨径流过程中径流水中汞的来源和转化，为研究复杂环境因素下较大水体的汞污染提供了基础。
更新日期：2024-07-04
中文翻译：
降雨径流过程中的汞来源、迁移和转化：汞同位素方法
径流水中的汞 (Hg) 对水生生态系统构成重大生态风险，可能影响生物体。然而，由于自然条件复杂，准确识别径流水中汞的来源和转化过程具有挑战性。这项研究对从降雨到径流的水中汞动态进行了全面的调查。对水中的汞同位素分馏进行了表征，从而可以准确量化汞的来源、迁移和降雨径流过程中的转化。 Δ200Hg和校正的Δ199Hg值可以作为识别径流水中汞源的可靠示踪剂，δ202Hg的变化可以通过汞转化过程来解释。在径流迁移过程中，降雨中的汞被陆地表面迅速吸收，而陆地汞通过溶解过程进入水中，成为溶解汞（DHg）的主要成分。除溶解和吸附外，微生物 Hg(II) 还原和 MeHg 去甲基化是流经稻田径流水中 DHg 的主要过程，而光化学 Hg(II) 还原是流经稻田径流水中 DHg 的主要过程。水交换率低。径流水中的颗粒汞 (PHg) 主要源自陆地物质，源自溶解和吸附过程。追踪降雨径流过程中径流水中汞的来源和转化，为研究复杂环境因素下较大水体的汞污染提供了基础。
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