Studies on Pollution Characteristics and Risk Assessment of Heavy Metals in Soil of industrial Enterprises in Industrial Parks
In order to understand the characteristics of heavy metals contamination in the soils,this paper taked 16 industrial enterprises in industrial parks of Ningxia as the resaerch object.soil heavy metals(As、Cd、Cu、Pb、Hg and Ni)were investigated and tested.The pollution status was evaluated by single factor pollution index method,Nemerow comprehensive pollution index method,ground accumulation index method,potential ecological hazard index method and geological accumulation index method.The average contents of As、Cd、Cu、Pb、Hg and Ni in the soils of survey area were 10.8、0.20、24、21.1、0.072 and 28 mg/kg,respectively,which were all lower than the threshold values of the secondary standard of National Environmental Quality Standard for Soil(GB 15618-2018)(pH>7.5).But the average contents of Hg,Cd,Pb and Cu were lower than the background value of Ningxia,while the average content of Hg was 2.6 times higher than the background value.Two analysis methods results(The single factor pollution index and Nemerow comprehensive pollution index)showed that the pollution degree was clean(safe)level,and the soil in the studied area showed no heavy metal pollution.Further,the ground accumulation index revealed that the soil was in slightly potential ecological risk.Although the soils industrial parks of Ningxia had little affects from the heavy metal pollution,but the accumulation of Hg and Cd were obvious,the impact of these two heavy metals on soil environment of industrial parks should be pay attention as soon as possible.
industrial parkssoil heavy metalsdistribution characteristicsecological risk
NETL
NSTL
万方数据
