宿州城市土壤重金属污染特征及其健康风险评价

选取宿州市不同功能区(工业区、商业区、车站附近、居民区以及城市绿地)采集表层土壤样品55个,利用XRF测定出土壤中重金属Cu、Zn、Pb、Cr、Mn、Ni的含量,并借助健康风险评价模型,分别评价了土壤重金属在不同暴露途径下的健康风险。结果表明,Cu、Zn、Pb和Cr的平均含量均超出安徽省土壤背景值,说明宿州城市土壤中已受到不同程度的重金属污染;工业区、商业区和车站附近土壤重金属含量普遍较高,Cu、Zn、Pb与交通运输、工业生产关系密切,Cr主要来源于工业废弃物排放,Ni则受到生活污染和交通污染的双重影响;土壤重金属的非致癌风险指数(HI)和致癌风险指数(Risk)均低于危害水平界限,未形成明显的健康风险。

Pollution Characteristics and Health Risk Assessment of Heavy Metals in Urban Soils of Suzhou

55 samples of surface soils were collected from different functional zones(including industrial district,commercial district,station nearby,residential area and urban green space) in Suzhou,and the concentrations of six heavy metals(Cu,Zn,Pb,Cr,Mn,Ni) in soils were determined by X-ray fluorescence spectrometer,then using health risk assessment model,the health risk of heavy metals under different exposure routes were respectively evaluated.The results showed that the mean concentrations of Cu,Zn,Pb and Cr were higher than the value of Anhui soil background,which illuminated that the urban soil of Suzhou have been polluted by heavy metals in various degree,and the concentrations of heavy metals in industrial district,commercial district and station nearby were relatively higher.Cu,Zn,Pb have close connection with transportation and industrial production,Cr mainly comes from the contamination of industrial production,and Ni is under the double influences of life and traffic pollution.Hazard indexes(HI) and non-carcinogenic risk(Risk) of heavy metals in urban soils were below the limits of harmful levels,and health risk of Suzhou did not obviously occurred.