摘要
为考察四川某金属制品厂对周边土壤的重金属污染情况,对厂区周边不同方位、不同距离土壤进行取样,测定土样中Zn、Cr、Pb含量,应用单因子污染指数法和内梅罗综合指数法评价土壤环境质量,并运用Hakanson潜在生态危害指数法评估该区域土壤潜在生态风险。结果表明,厂区周边土壤Zn、Cr质量浓度平均值超过成都市土壤背景值,土样中Zn、Cr、Pb超标率分别为58.7%、94.1%、18.3%;0~10cm表层土样Zn质量浓度显著高于10~20cm亚表层土样,两土层Cr、Pb浓度没有显著差异;3种重金属在土壤中迁移能力为Cr>Pb>Zn,风向不是影响土壤重金属分布的主要因素;研究区域土壤Zn、Cr处于轻度污染水平,总体处于中度污染水平;研究区3种重金属的潜在生态风险程度依次为Pb>Cr>Zn,整体处于轻度综合潜在生态风险水平。
In order to explore the heavy metal pollution status of soil in area surrounding a metal products factory in Sichuan province,the soils in different distance and direction of metal products factory were sampled and the concentrations of heavy metals(Pb,Zn,and Cr)were analyzed.The soil quality was evaluated by single factor pollution index and comprehensive pollution index,and the Hakanson potential ecological index was applied to assess the potential ecological risks of the soils.The mean values of Zn and Cr in soils were higher than those of the background values of Chengdu.The standard exceeding ratios of Zn,Cr,and Pb were 58.7%,94.1%,18.3%.The concentrations of Zn in 0-10 cm soil profile were generally higher than those of the 10-20 cm soil profile,and there was no significant difference between the Cr and Pb concentrations of the two soil profile.The transfer ability of heavy metals followed the order of Cr>Pb>Zn,and the wind direction was not the main factor that affect the heavy metal distribution in soils.The Cr and Zn in soils of the study area were lightly polluted,its overall in the moderate pollution level;the soils in the study area were in low ecological risk level,and the order of risk level was Pb>Cr>Zn.
作者
罗后巧
段启超
何文艳
王梅
于雅琪
李金鑫
杨金燕
LUO Houqiao;DUAN Qichao;HE Wenyan;WANG Mei;YU Yaqi;LI Jinxin;YANG Jinyan(College of Architecture and Environment,Sichuan University,Chengdu Sichuan 610065)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2018年第4期440-444,共5页
Environmental Pollution & Control
基金
四川省科技厅国际合作项目(No.2015HH0023)
成都市科技局惠民项目(No.2015-HM01-00180-SF)
关键词
土壤
重金属
分布特征
污染水平
生态风险
soil
heavy metals
distribution characteristics
pollution level
ecological risk
