娘子关泉域地表河流沉积物重金属污染特征与潜在生态风险  

Pollution characteristics and potential ecological risk of heavy metals in the river sediments of Niangziguan karst water system

作　　者：申豪勇 梁永平[1] 王维泰[1] 赵春红[1] 唐春雷[1] 

机构地区：[1]中国地质科学院岩溶地质研究所/国土资源部广西壮族自治区岩溶动力学重点实验室,桂林541004

出　　处：《环境化学》2016年第10期2051-2059,共9页Environmental Chemistry

基　　金：中国地质调查项目(12120114019101);中国地质科学院岩溶地质研究所基本科研业务费项目(201406)资助~~

摘　　要：以娘子关泉域桃河和温河流域为研究对象,分析了研究区内30个采样点中8种重金属的含量及空间分布特征,并对其来源及潜在生态风险进行了评价.河流沉积物中Cu、Pb、Zn、Cr、Ni、Cd、As、Hg的平均含量分别为35.72、43.82、187.99、76.50、43.18、0.90、12.70、0.45 mg·kg-1.来源分析结果表明,Cu、Zn、As、Hg主要来自于矿坑排水和生活污水的混合排放,Pb主要来自于工业点源污染,Cr和Ni具有一定的同源性,而Cd主要来源于农药和化肥的使用.地积累指数评价结果显示,各重金属的污染程度由高到低依次为:Hg>Zn>Pb>Cd>Cu>Ni>Cr=As;各种重金属的潜在生态风险从高到底依次为:Hg>Cd>As>Pb>Cu>Ni>Zn>Cr,Hg和Cd虽然在沉积物中的含量很低,但其对生态风险指数的贡献分别为57.88%和32.51%.潜在生态风险指数显示南川河具有极强的潜在生态风险,需重点关注.Surface sediment samples were taken from Taohe and Wenhe Basin. And the concentrations and spatial distribution characteristics of 8 heavy metals in 30 sediments samples were analyzed. The source and potential ecological risks of each heavy metal were evaluated. The mean concentration of 8 heavy metals including Cu,Pb,Zn,Cr,Ni,Cd,As and Hg were 35. 72,43. 82,187. 99,76. 50,43. 18,0. 90,12. 70,0. 45 mg·kg^-1,respectively. The source of Cu,Zn,As,Hg in the sediments came mainly from mine drainage and domestic sewage,and Pb came mainly from industrial wastewater. The source of Cr and Ni were similar. Cd came mainly from the use of pesticide and chemical fertilizer. The pollution extent of heavy metals in sediments by geoaccumulation index followed the order of Hg 〉Zn 〉Pb 〉Cd 〉Cu 〉Ni〉 Cr = As. The potential ecological risk of 8 heavy metals followed the order of Hg〉 Cd〉 As 〉Pb 〉Cu〉 Ni〉 Zn Cr.Although the concentration of Hg and Cd were extremely low,they contributed the most to the totalpotential ecological risk,accounting for 57. 88% and 32. 51%,respectively. The risk assessment code showed that Nanchuan River had very high risk level. Therefore,it should be taken more considerations in the river management.

关 键 词：沉积物 重金属 地积累指数 生态风险 娘子关 

分 类 号：X52[环境科学与工程—环境工程] X826