摘要
汞(Hg)作为一种有毒重金属污染物,在全球范围内受到广泛关注。有机汞尤其是甲基汞的毒性比无机汞毒性更大,且易在食物链中积累,因此无机汞—有机汞的转化问题近年来备受关注。之前的研究多集中于海洋环境中的Hg甲基化问题,对于淡水环境尤其是湿地环境Hg甲基化的研究相对欠缺。而湿地环境的特殊性与复杂性使其成为突出的甲基汞产出单元,且生物积累作用明显。通过系统总结湿地中无机汞—有机汞转化的途径和机理以及其影响因素和相关生物作用,指出沉积物、颗粒有机碳和周丛生物是重要的甲基汞产生微环境,频繁密切的生物间相互作用成为湿地高甲基化潜力的保障。因此加强各类湿地Hg甲基化研究对保护湿地生态及居民健康具有重要意义。
Mercury has received widespread attention as a toxic heavy metal contaminant.Organic mercury,especially methyl mercury(MeHg),is more toxic than inorganic mercury and can easily accumulate in the food chain;therefore,the problem of inorganic to organic mercury conversion has attracted much attention in recent years.Most previous research has focused on mercury methylation in marine environments,and research on freshwater environments,especially wetlands,is lacking.The uniqueness and complexity of the wetland environment make it a prominent MeHg production unit,and the bioaccumulation effect is evident.In the present study,the pathways,mechanisms,influencing factors,and related biological effects of organic mercury conversion to inorganic mercury in wetlands are systematically summarized.Sediments,particulate organic carbon,and periphyton organisms are important microenvironments for MeHg generation,and frequent interactions between organisms guarantee the high methylation potential of wetlands.Therefore,strengthening the research on Hg methylation in various wetlands is of great significance for protecting the ecology of wetlands and the health of residents.
作者
李博
殷怡童
关翔宇
武雄
罗锡明
LI Bo;YIN Yitong;GUAN Xiangyu;WU Xiong;LUO Ximing(School of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China;School of Water Resources&Environment,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《地球科学进展》
CAS
CSCD
北大核心
2023年第4期363-376,共14页
Advances in Earth Science
基金
国家自然科学基金重点项目“典型抗生素对地下水系统中反硝化过程的影响机理研究”(编号:41731282)
中国地质调查局项目“地下水中有机污染组分对补给方式的响应——水样测试分析质量控制”(编号:DD20190323)资助
关键词
湿地
Hg甲基化
去甲基化
生物作用
Wetland
Mercury methylation
Demethylation
Biological function.
作者简介
李博(1999-),男,内蒙古通辽人,硕士研究生,主要从事污染物迁移转化研究.E-mail:lililo0220@126.com;通信作者:罗锡明(1967-),男,河北保定人,教授,主要从事海岸带地质环境、场地污染修复研究.E-mail:luoxm@cugb.edu.cn
