RAO Zhi1, CHU Xiaodong1,2, YAN Chun1, CHEN Ting1, HE Jingyuan1, DUN Junyi2, WU Daishe2
（1.Jiangxi Institute of Geo-Environment Monitoring, Nanchang, 330095, China;
2. School Of Resources Environment & Chemical Engineering Nanchang University , Nanchang , 330031, China）
Abstract: In order to understand the status of organic pollution in groundwater of the Poyang lake plain, 14 kinds of volatile organic compounds (VOCs) and 10 kinds of semi-volatile organic compounds (SVOCs) in groundwater samples were analyzed and their health risks were assessed by the health risk assessment model from USEPA. The results showed that organic pollution in groundwater of the Poyang lake plain had become nonnegligible, the main organic pollutants were found to be 1,1,2-trichloroethane, benzo-[a]-pyrene and naphthalene, and detection rates of VOCs and SVOCs were in the ranges of 6.06%-15.15% and 3.03%-27.27%, respectively. The organic pollution status in groundwater of the Poyang lake plain could be classified into 4 levels, non-pollution, light pollution, moderate pollution and serious pollution, according to the Nemerow's comprehensive pollution index method. Three major sources of organic pollutants were pesticides, petrochemical companies, and garbage landfills in the study area. The risks of carcinogenic chemicals in drinking water were significantly higher than those of non-carcinogenic chemicals, and carcinogenic risks of trichloroethylene, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,2,2-tetrachloroethane, 1,2-dichloropropane, 1,1 ,2-trichloroethane and benzo-[a]-pyrene were 7.06, 1.06, 18.7, 54, 1.64, 14.4, 2.87 times, respectively, of their acceptable levels. The carcinogenic risk index of a-hexachlorocyclohexane, the main substance of carcinogenic risk in groundwater of the study area, in drinking water was as high as 1.03×10-4. This paper provided a theoretical basis in the groundwater pollution study to control and supervise groundwater quality in the Poyang lake plain, and provided references for monitoring and controlling of groundwater organic pollutants in other regions.
Keywords: Organic compounds; Health risk assessment; Poyang Lake Plain; Groundwater
EARTH AND ENVIRONMENT Vol.47, No.5, Tot No.331, 2019, Page 662-670
