Risk Assessment of Pb,Cd,Cu and Zn in Farmland and Rice System Around Qujing City
Food security is threatened by heavy metal contamination in farmland,posing risks to human health.Urgent efforts are needed to assess migration of heavy metal pollutants in farmland and their accumulation in edible parts of crops.This study focuses on soil and rice samples collected from four sample locations near Wule Diandong Power Plant in Huangnihe Town,Fuyuan County,Yunnan Province,namely,Shanglezi,Chengli-tou,Jiangjiazawai and Puxiang.The concentrations of Pb,Cd,Cu,and Zn were determined in both soil and rice grain samples.The single factor and comprehensive pollution index of Pb,Cd,Cu,and Zn in the soil and rice grains were evaluated.The results showed that the comprehensive ecological risk indexes for Shangpingzi and Chengtou were 201.26 and 153.3,respectively,indicating a medium level of ecological damage.Conversely,the soil in Jiangjiazhawai and Puxiang was slightly damaged.Analysis of rice grain samples from Shangpingzi,Chengtou,and Puxiang revealed heavy pollution of Pb and Cd,with Zn showing light pollution,and Cu not reac-hing pollution levels.However,the most serious pollutant in the rice grains were Pb and Cd,while Cu and Zn did not reach the pollution level.Cd was the main pollution element in the study area and reached the level of severe pollution.Pi value of Pb,Cu and Zn was less than 1,which did not constitute pollution.According to the com-prehensive evaluation of the pollution index of soil rice grain,the comprehensive index of heavy metal pollution of rice in the study area has reached the level of heavy pollution.
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