摘要
以湘西境内凤凰铅锌矿区不同区域的地表水为对象,研究了铅锌矿区水体中Pb、Zn、Hg等元素的污染状况及成因。结果表明,凤凰铅锌矿区内地表水受到重金属复合污染,其中水Pb严重污染,水Zn轻度污染,水Hg中度污染。矿区地表水中Pb、Zn、Hg平均含量分别为(0.145±0.060)mg·L-1(、0.362±0.393)mg·L-1和(0.175±0.359)!g·L-1,与地表水环境质量国家标准(GB3828-2002)相比,矿区水Pb平均含量超过国标Ⅳ类水质量标准2.9倍,Zn基本符合国家Ⅲ类水水质标准,Hg超过国标Ⅲ类水质量标准1.75倍。溪流水体自净作用对水质重金属污染具有一定的修复能力,该能力受距污染源的距离、流程长度以及水质污染程度的影响。水体中Pb、Zn、Hg的含量受原生地球化学环境的控制,同时,表生地球化学作用和人为采选矿活动也深刻影响它们在水体中的分布。
The concentrations and distribution patterns of lead, zinc, mercury in surface water of Fenghuang lead-zinc deposit area of western Hunan province and its natural and human causes were studied.The surface water in the deposit area is seriously polluted by lead, light polluted by zinc and moderately polluted by mercury. The average concentration of lead, zinc and mercury in the surface water of the area is 0.145±0.060 mg·L^-1, 0.362±0.393 mg·L^-1 and 0.175±0.359μg·L^-1, respectively. In comparison with the environmental quality standard GB3828-2002 for surface water, the concentration of lead in the surface water is 2.9 times higher than the benchmark value of the IV grade surface water, while mercury 1.75 times higher than the benchmark value of the Ill grade surface water. Self-purification of rivulet water body can somewhat do work for remediation of the contaminated water. But the remediation capacity depends upon the distance from the pollution source, scalar transport in rivulet flows and the pollution grades of the contaminated water. The concentration and distribution of heavy metal pollutants such as lead, zinc and mercury in surface water in the deposit area are dominated by the original geochemical situation but seriously affected by superficial geochemical process and human mining activities.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第1期103-107,共5页
Journal of Agro-Environment Science
基金
国家自然科学基金(40571008)
中国科学院知识创新工程重要方向资助项目(KZCX3-SW-437)
关键词
采选矿活动
汞
铅
重金属污染
水
矿区
mining activity
mercury
lead
heavy metal pollution
water
, deposit area
