辽河干流沉积物重金属污染特征及潜在生态风险评价  

POLLUTION CHARACTERISTICS AND POTENTIAL ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN SEDIMENTS FROM THE MAINSTREAM OF LIAOHE RIVER

作　　者：王辉[1] 赵悦铭 刘春跃 王英刚[1] 吴昊[1] 王晓旭[1] 罗庆[1] WANG Hui;ZHAO Yue-ming;LIU Chun-yue;WANG Ying-gang;WU Hao;WANG Xiao-xu;LUO Qing(Key Laboratory of Regional Environment and Eco-remediation,Ministry of Education,Shenyang University,Shenyang 110044,China)

机构地区：[1]沈阳大学区域污染环境生态修复教育部重点实验室

出　　处：《环境工程》2019年第11期65-69,165,共6页Environmental Engineering

基　　金：国家水体控制与治理科技重大专项(2018ZX07601-002,2018ZX07601-003-04)

摘　　要：在辽河干流共设置24个监测点位,进行表层沉积物样品的采集,测定沉积物样品中Cr、Ni、Zn、Pb、Cu和As的浓度,并在此基础上,采用单因子污染指数法、富集系数法和潜在生态风险评价指标法对沉积物中重金属污染状况和潜在生态风险进行了评价。结果表明:沉积物中6种元素平均浓度顺序为Cr>Zn>Cu>Ni>Pb>As,但均未超过GB 15618—2018《土壤环境质量农用地土壤污染风险管控标准》中的标准值,且沉积物中Pb、Zn、Cu、Ni和Cr的浓度相比南方部分省份河流较低。各种重金属的富集程度较低,其中As和Zn处于中度污染程度,Ni、Pb、Cu和Cr处于轻度污染程度。单因子污染指数法和潜在生态风险评价指标结果表明:辽河干流沉积物中重金属污染处于低风险状态,但As存在中度风险点位,应予以关注。研究结果为治理辽河污染,加强环境保护和水环境管理水平提供参考。Aiming at the characteristics and its potential ecological risks of heavy metal pollution in the surface sediments from the mainstream of Liaohe River,a total of 24 surface sediment samples were collected to determine the concentrations of six elements:Cr,Ni,Zn,Pb,Cu and As.Then,the single factor pollution index method,enrichment factor method and potential ecological risk assessment index were used to evaluate the heavy metal pollution and potential ecological risk in sediments.The results showed that the concentration of six heavy metals were decreased in the order of Cr>Zn>Cu>Ni>Pb>As,which did not exceed the standard value,and compared with some other rivers in Southern China,the contents of Pb,Zn,Cu,Ni and Cr were lower.According to the enrichment factor,enrichment degrees of heavy metals were lower,and the enrichment factors of heavy metals were mild except As and Zn.According to the potential ecological risk indicators,average potential ecological risk index of single metal and multiple metals showed that ecological risk was low.But the potential ecological risk of As was moderate in some sample sites,and enough attention should be paid on the pollution of As.This study suggested some instrumental information and data for environmental management,which was helpful for environmental protection in Liaohe River.

关 键 词：辽河干流 富集系数 单因子污染指数法 潜在生态风险评价 

分 类 号：X52[环境科学与工程—环境工程]