Heavy Metal Content Characteristics and Health Risk Assessment of Rice in Shuijiang Area of Chongqing City

Rice contents in Shuijiang area of southern Chongqing were studied.Contents of As，Hg，Cd，Cr，Cu，Pb and Zn in rice were analyzed，and health risks caused by eating rice in adults and children were evaluated.Results showed that average values of As，Hg，Cd，Cr，Cu，Pb and Zn were 0.13，0.005，0.14，0.11，3.11，0.10 and 22.99 mg/kg，respectively，and Hg，Cr，Cu and Zn elements were not exceeded.Over-standard rates of the As，Pb and Cd elements were 8%，8% and 32%，respectively.Eating local rice，As element had obvious health risks for adults，As and Cd had obvious health risks for children，adult and children′s composite heavy metal health risk index was 4.64 and 7.25，respectively，with significant health risks，of which As element played a decisive role in the overall health risk level.