Characteristics of high arsenic groundwater in Hetao Basin,Inner Mongolia,northern China

查看全文 作　　者：YangChun [1]Zhu;XueYong [1]Zhao;Min [1]Chen;YongQing [1]Luo;Xin [1]Zhou

机构地区：[1]Naiman Desertification Research Station,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences

出　　处：《Research in Cold and Arid Regions》索引2015年第7卷第1期,共7页

基　　金：financially supported by the research projects 2011BAC07B02,XDA05050201-04-01,and 31170413 摘　　要：It is well known that the Hetao Basin is one of the most seriously arsenic-affected groundwater areas in China. In order to understand the characteristics of high arsenic(As) groundwater in the Basin, a brief overview of arsenic in groundwater follows. High arsenic in the Basin commonly occurs in shallow groundwater and the total arsenic concentrations range from 0.58 to 572 μg/L(average 99.73 μg/L), exceeding the maximum mandated value of 10 μg/L for drinking water in China; As(Ш) is the predominant species. The regional distribution pattern of arsenic in the groundwater increases from south/southeast to north/northwest. Hangjinhouqi and Wuyuan counties are considered as the most seriously affected areas, with high incidences of endemic arsenicosic diseases in the Hetao Basin. High groundwater arsenic correlates with the increase of well depth. Previous studies proposed that groundwater arsenic in the Basin is mainly originated from desorption of some natural solid materials in the sediments, under reducing condition. Generally, reducing condition is believed to be the primary factor for arsenic releasing from the sediment to groundwater in the region. Under inorganic or bacterial processes, Fe2O3 changes to Fe S and arsenic adsorbed to Fe(OH)3 dissolves into groundwater, and As(V) is reduced to As(Ш). Besides, reducing environments, groundwater hydraulic gradients, organic matter, p H, evapotranspiration, and soil texture are presumed to be the predominant factors that control arsenic mobilization. 关键词：浅层地下水河套盆地中国北方高砷内蒙古 FE2O3 浓度范围分布格局

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Characteristics of high arsenic groundwater in Hetao Basin,Inner Mongolia,northern China

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