Heavy Metal Pollution Evaluation and Correlation Analysis of Farmland Soil and Crops in Dongyang City
Taking the farmland area of Dongyang as the research object,the safety of agricultural products was investigated mainly in the basic farmland protection area and the abnormal heavy metal area of soil geochemical investigation.The contents of As,Cd,Cr,Cu,Hg,Ni,Pb and Zn in the soil and crops of Dongyang were determined by point-to-point collaborative sampling method.Soil heavy metal pollution was evaluated by soil accumulation index and potential ecological risk index.The results showed that Cd and Pb pollution existed in the study area,compared with the risk screening value of agricultural land,the over-standard rates were 11.67％and 5.0％.There were Cd and As pollution in crops,compared with the limit of food pollutants,the content of heavy metals As and Cd in 70 pieces of rice samples exceeded the standard,and the over-standard rates were 25.71％and 10.0％;The heavy metal Cd in 14 pieces of taro samples exceeded the standard,and the over-standard rate was 42.86％.Soil pollution evaluation showed that heavy metals such as Cd had strong ecological risk,while other heavy metals had slight ecological risk acceptable range.Correlation analysis showed that As and Cr in soil had antagonistic effects on the absorption of rice,while Cu and Ni in soil had promoting effects on the absorption of Cd in rice.As and Ni in soil had antagonistic effects on the absorption of Cu,Cr,Pb and Zn in taro,while As and Ni in soil had promoting effects on the absorption of Cd in taro.
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