Study on the Distribution Characteristics and Health Risks of Heavy Metal Pollution in the Soil of a Fertilizer Factory Legacy Site
To reveal the status and distribution characteristics of heavy metal pollution in the soil of fertilizer production sites,this study focused on the legacy site of a fertilizer factory in Hubei,and detected and analyzed a total of 80 soil samples from 23 locations.The results show that 7 heavy metals could be detected on the site,including As,Cd,Cu,Pb,Hg,Ni,and Cr6+.The concentration range of As was between 18.9～176 mg/kg,which exceeded the second type of land screening value of the Soil Environmental Quality:Risk Control Standard for Soil Contamination of Development Land(GB 36600-2018),with a sample rate of 56.25％.The maximum single factor pollution index,geo-accumulation index,and potential ecological risk index of As among the tested soil samples were 2.93,3.14,and 132.33,respectively,which were classified as moderate pollu-tion,near-heavy pollution,and near-strong ecological risk,respectively.The vertical As pollution depth of typical sites exceeded 5.4 m,which was related to the reason that the surface plain fill of the site was not conducive to the interception of As,causing it to migrate in a dissolved state with the rainwater runoff towards the deep layer.A human health risk assessment was conducted on the soil of the site,and it was found that the total carcinogenic risk of As was 1.2E-04,and the non-carcino-genic risk hazard quotient was 2.10,which far exceeded the acceptable levels for human health.The cement kiln collaborative disposal technology was recommended to use for this site remediation.
fertilizer plantlegacy sitesoil pollutionheavy metalshuman health risk
NETL
NSTL
万方数据
