摘要
对大宝山槽对坑尾矿库区及其周边地区地下水18个采样点水体中的重金属(Pb、Cu、Mn、As、Cd)含量进行研究,并采用美国环境保护局(USEPA)推荐的健康风险评价模型,对研究区域的地下水重金属进行健康风险评价。研究结果表明:该区域地下水的重金属致癌风险较高,化学致癌物(As、Cd)的健康风险值超出化学非致癌物质(Cu、Pb、Mn)3～5个数量级,致癌重金属As的风险值数量级在10-5的比例约为16.7%;该区域化学非致癌物健康风险平均值排序是Cu>Pb>Mn,其中大部分(比例大于94%)Mn和Pb的非致癌风险值低于最大可接受风险值(5.05×10-5a-1)。该研究区域重金属污染物的优先控制顺序为:Cd>As>Cu>Pb>Mn。
Groundwater is the primary drinking water source for the residents at the Dabaoshan tailing zone and its surrounding areas,To assess of the heavy metal pollution in this region,18 groundwater samples were collected and concentrations of Pb,Cu,Mn,As,and Cd in the samples were measured.Risk assessment was conducted using the environmental health risk assessment model recommended by U S EPA.The results showed that carcinogenic risks caused by the heavy metal are relatively high in the study area.The contents of Pb,Cd,Cu and Mn in groundwater at the Dabaoshan tailing area were 4 times,26 times,28 times,and 312 times higher than the concentrations corresponding to the quality standards of levelⅢgroundwater,indicating that the mining activity greatly affected the groundwater quality.The carcinogen risk values was 103～105 times higher than that caused by non-carcinogenic risks.Moreover,16.7% of the carcinogenic risk values of As exceeded the maximum acceptable levels set by USEPA.And followed the order of AsCd.The mean values of carcinogen risks followed the order of CuPbMn.Most of the carcinogenic risk values（94%）of Mn and Pb exceeded the accepted level 5.05×10-5 a-1 as suggested by International Commission on Radiological Protection.Thus,heavy metal pollution control in this area should be prioritized in the order of CdAsCuPbMn.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2013年第3期587-594,共8页
Journal of Agro-Environment Science
基金
公益性科研所基本科研业务专项(ZX-200809-06)
863计划(SQ2009AA06XK1482462)
水专项-东江流域水污染系统控制(2008ZX07211-0010)
环保公益项目(201109024)
关键词
大宝山尾矿库区
地下水
重金属
健康风险评价
Dabaoshan tailing zone
groundwater
heavy metals
health risks assessment
