Risk assessment and source analysis of heavy metals in cultivated soil around a development zone of northern Henan Province
In order to evaluate the heavy metal pollution status,potential risk characteristics,and pollution sources in the farmland soil surrounding a development zone,the contents of 8 heavy metals in the topsoil were analyzed and assessed.The results showed that the Cd content in all 40 samples exceeded the screening value for agricultural soil pollution risk.The geo-accumulation indices of Zn,Pb,Cd,and Hg were greater than 1,indicating certain accumulation levels.Heavy metals in the soil presented a strong potential ecological risk,with Cd showing the highest potential ecological risk level,followed by Hg.The average comprehensive potential ecological risk level of heavy metals in the soil was extremely strong,with Cd and Hg contributing significantly.The health risk assessment for adults indicated that non-carcinogenic health risk indices were all less than 1,implying acceptable risk.However,the Cd carcinogenic risk index for one soil sample was greater than 10-4,indicating a certain carcinogenic risk.A receptor model was used to analyze the sources of heavy metals,showing that Cr,Ni,Cu,and As were mainly influenced by natural factors such as soil parent material,while Cd,Pb,Hg,and Zn were primarily affected by industrial sources related to heavy metal enterprises.In conclusion,Cd pollution in the farmland surrounding the develop-ment zone was significant and mainly originated from heavy metal-related enterprises.Measures should be taken to ensure the safe use of farmland by controlling heavy metal emissions from these enterprises.
万方数据
维普
