Potential risk assessment of heavy metal pollution in soil

For investigation of the risk assessment of Cd and Ni pollution in soil,the authors used geo-accumulation index and potential ecological risk index methods,taking the soils in riverbed and farmland of one river in North China as an example.The results showed that the soils from riverbed and farmland near waste smelting center were severely polluted by Cd and Ni,which were higher than the local background soil value.The enrichment degree of heavy metals in riverbed was CdNi,and the Cd reached grade 5(heavy pollution degree).Compared with the local soil background value,the concentration of heavy metals in the river showed serious ecological risk,and the order of potential ecological risk of the two heavy metals was CdNi.