Abstract:
In order to understand the concentration of heavy metals and the level of health risk in the drinking water of a township in Guizhou Province,this paper detected and analyzed the concentration of eight heavy metals in the drinking water of 12 villages in the township,and used the health risk assessment model recommended by the US EPA to estimate the health risk caused by heavy metals in the drinking water route.The results showed that the concentration of Ni(63.027μg·L
-1)in No.1 village exceeded the limit of national hygienic standard for drinking water.Pearson correlation analysis showed that Ni,Cd,As,Pb and Cu were strongly correlated with the correlation coefficient above 0.6,indicating that these elements have certain homology or similar geochemical characteristics.The average personal annual health risk from Cr in drinking water in the village of 1
#,2
#,3
#,4
#,6
#,10
#and 12
#for both adults and children exceeds the maximum acceptable risk recommended by international bodies such as the Royal Society(1.0×10
-6·a
-1),the long-term drinking ground water or well water without treatment in this 7 villages will produce certain risk of cancer.The total health risk of children was higher than that of adults,so it is necessary to strengthen the control and management of children′s drinking water safety.The average contribution rate of Cr and As to the total risk of adult and child health was 98.57%,which should be taken as the priority pollutants for control and management.