Distribution Characteristics and Health Risk Assessment of Heavy Metals Content in a Drinking Water Source Area
In order to explore the distribution characteristics and human health risks of heavy metals in water bodies of lake-reservoir type drinking water sources,the drinking water from a reservoir in a prefecture-level city in central Yunnan Province was selected as the re-searchregion.Based on the data of water quality routine monitoring from the local ecological environment monitoring department in the past three years,the concentration levels and distribution characteristics of eight heavy metals(Zn,Pb,Fe,Cd,Mn,Cr6+,As and Hg)in the reservoir area and inlet river were analyzed.The health risk assessment model recommended by the United States Environmental Protection Agency(US EPA)was used for human health risk assessment.The results show that Hg,Cr6+,Pb and Cd are not detected in the reservoir area and the inflow river in the study area from 2019 to 2021.Zn,As,Fe and Mn are detected to varying degrees,and the high concentra-tions are concentrated in the inflow rivers.The high concentration of heavy metals in the inflow river appeared in the wet season,while the reservoir area appeared in the dry season.Among them,the maximum concentration of iron and manganese is exceeded the limit of drinking water and water environmental quality standards of China.Health risk assessment of metals in the study region shows that non-carcinogenic metals Pb,Hg,Zn,Fe and Mn have no risk to adults are children through drinking water.The maximum carcinogenic risk values of carcino-genic metals As,Cd and Cr6+to adults are almost equal to the recommended limit value of the International Commission on Radiological Pro-tection(ICRP),which needs to be given high priority.However,the maximum health risk level for children has exceeded the recommended limit of ICRP,and there is a risk of cancer.For researched metals,Cr6+and As are the determinants of cancer risk in children and should be given priority control in children's drinking water.
heavy metalhuman health risksdrinking water source
万方数据
维普
