高砷地下水系统中非岩石圈源的沉积物砷异常  

Beyond the geological origin of sediment arsenic in groundwater systems:arsenic redux by redox

作　　者：韩龙 孙雨芹 李曾一 段艳华 韩双宝 张海龙 赵美训 郑焰 Long Han;Yuqin Sun;Zengyi Li;Yanhua Duan;Shuangbao Han;Hailong Zhang;Meixun Zhao;Yan Zheng(State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;School of Biological Sciences,University of East Anglia,Norwich NR47TJ,UK;Frontiers Science Center for Deep Ocean Multispheres and Earth System,Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China;Center for Hydrogeology and Environmental Geology Survey,China Geological Survey,Baoding 071051,China)

机构地区：[1]State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [2]Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [3]School of Biological Sciences,University of East Anglia,Norwich NR47TJ,UK [4]Frontiers Science Center for Deep Ocean Multispheres and Earth System,Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China [5]Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China [6]Center for Hydrogeology and Environmental Geology Survey,China Geological Survey,Baoding 071051,China

出　　处：《Science Bulletin》2023年第15期1616-1620,M0003,共6页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(41831279 and 42230412)。

摘　　要：世界卫生组织认定无机砷为危害全球公众健康的十大化学物质之一.学术界普遍认为地下水中无机砷源自地层,非人为污染所致,从基岩或经风化搬运形成的松散沉积物含水层中释放进入地下水,但鲜见岩石圈砷异常的报道.本研究对银川平原高砷地下水系统中沉积物的物源和砷源开展了定量溯源,构建了基于粒度、无机化学参数(Fe/Al和Si/Al比)及有机碳-13和碳-14的无机物源、有机物源及砷源端元模型,发现沉积物中存在贺兰山和黄河等岩石圈源之外的“过量砷”;结合环青藏高原多个高砷地下水区文献数据分析,发现可通过As/Fe摩尔比大于0.0003识别沉积物砷异常.鉴于砷在地表-地下水交互界面的氧化次生富集,提出该异常源自水圈,可循环进入地下水“再生”.这可解释全球高砷地下水冲洪积平原上游地区无显著岩石圈砷异常之谜.Geogenic arsenic(As)in sediments of numerous Holocene aquifers has been recognized as the culprit for elevated As(>10μg/L)levels detected in groundwater of many countries,threatening the health of an estimated 94 to 220 million people,mostly in Asian countries downgradient of the Tibetan Plateau[1,2].Much progress has been made on elucidating the coupled hydrogeologi-cal and biogeochemical processes involved in mobilizing sediment As to groundwater[3],yet little is known regarding the exact geo-logical origin of such sediment As.

关 键 词：高砷地下水 松散沉积物 岩石圈 次生富集 化学物质 银川平原 冲洪积平原 交互界面 

分 类 号：P641.12[天文地球—地质矿产勘探]