Determination and Health Risk Assessment of Heavy Metals on the Source of Underground Water in Yulin City

The source of the underground water in Yulin city were applied to monitor and evaluate five kinds of heavy metals which are Cr6+, Cd, As, Pb and Hg, and it revealed that the concentration of them were lower than the "drinking water health standards" (GB5749-2006), taking the source of drinking water in Yulin University as an example. A preliminary health risk assessment of the risk caused by drinking water has been done, based on the health risk assessment model recommended by USA Environmental Protection Agency. The datum showed that the health risk of carcinogenic substances (Cr6+, Cd and As) were much larger than that of non-carcinogenic substances (Pb, Hg) , so the priority control sequence should be Cr6+>Cd>As>Pb>Hg. The result showed that, human health of personal annual risk caused by the heavy metal pollutants in drinking water from the campus of Yulin University had exceeded the acceptable health risk level of 5 × 10-5/a which is established by the Radiation Protection Committee. Cr6+ is the main contribution, and should cause the attention of the relevant departments, also is the priority governance indicators.