摘要
黔西南滥木厂铊矿化区河流沉积物中重金属元素的含量很高,其环境污染和生态危害值得关注。本文采用地质累积指数(Igeo)和潜在生态危害指数(RI)对重金属污染及其潜在生态危害进行了评价。结果表明,滥木厂河流沉积物中重金属存在较强程度的污染,并具有较强程度的潜在生态危害。主要的污染元素为Tl、As和Cd,而Cr、Zn、Pb、Cu基本上处于无污染或轻微污染的水平。河流沉积物重金属的污染在上游河段较下游河段严重。重金属平均潜在生态危害的排序为:矿山影响区Tl>Cd>As>Pb>Cr>Cu>Zn;矿山未影响区Cd>Tl>Pb>Cr>As>Cu>Zn。
Stream sediments of the Lanmuchang Tl mineralized area in Southwest Guizhou have been polluted by heavy metals, and its environmental pollution and ecological risk should be considered. This paper assesses the heavy metal pollution and its potential ecological risk by means of geological accumulation index （Igeo） and potential ecological risk factor （Igeo）. The results indicate that stream sediments of the study area are of obvious heavy metal pollution and show serious potential ecological risks. The main contaminating elements are Tl, As, and Cd, but the metals of Cr, Zn, Pb, and Cu are all in the degree of less pollution. The heavy metal pollution in upstream sediments section is more serious than in downstream sediments. The orders of heavy metal potential ecological risks on average are as flows： in mine-impacted area Tl〉Cd〉As〉Pb〉Cr〉Cu〉Zn, and in mine non-impacted area Cd〉Tl〉Pb〉Cr〉As〉Cu〉Zn.
出处
《地球与环境》
CAS
CSCD
北大核心
2007年第3期247-254,共8页
Earth and Environment
基金
中国科学院2007年"西部之光"项目资助
关键词
沉积物
重金属污染
地质累积指数
潜在生态危害指数
黔西南
sediment
heavy metal pollution
geological accumulation index
potential ecological risk factor
Southwest Guizhou
