The characteristics and health risk assessment of volatile and semi-volatile organic pollutants in groundwater in Tai'an urban area
In order to investigate the current status of organic pollution in groundwater in Tai'an urban area,26 volatile and semi-volatile organic pollutant components specified in the"Standard for groundwater quality"(GB/T 14848-2017)were tested,and a health risk assessment model was used to evaluate the non-carcinogenic and carcinogenic risks generated by three exposure pathways(drinking water intake,skin contact,and bathing breathing inhalation).The research results showed that the detection rate of volatile and semi-volatile organic pollutants in groundwater samples was 35.34％.Among the 15 detected components,1,1,2-trichloroethane had the highest detection rate of 16.38％,followed by tetrachloroethylene(12.07％)and trichloroethylene(6.90％).Compared with the limit values of Class Ⅲ water standards in the GB/T 14848-2017,the total exceeding rate of volatile and semi-volatile organic compounds was 5.17％.The components that exceeded the standard were 1,1,2-trichloroethane,trichloroethylene and benzo(a)pyrene,with the maximum detected concentrations being 26.90,149.00 and 0.024 μg/L respectively,which was 5.38,2.13 and 2.40 times of the standard value,indicating that the groundwater in the study area had been polluted to a certain extent by organic pollutants.The non-carcinogenic risk index for volatile and semi-volatile organic pollutants ranged from 1.52×10-6 to 1.48,with a mean of 4.33×10-2 and a limit exceeding rate of only 0.86％,indicating a low non-carcinogenic risk and a low degree of harm to human health.The cancer risk value was 2.04×10-9 to 3.37 × 10-5,with a mean of 1.77×10-6 and a limit exceeding rate of 6.90％,and the risk points were distributed in spots.The components that caused cancer risk were 1,1,2-trichloroethane,trichloromethane and trichloroethylene,which needed to be focused on and controlled.The main exposure pathway of non-carcinogenic risk and carcinogenic risk were through drinking water intake,while the risks arising from skin contact and bathing breathing inhalation could be ignored.The research results have guiding significance for the safety of groundwater supply and the prevention and control of organic pollution in the urban area of Tai'an.
groundwatervolatile and semi-volatile organic pollutantshealth risk assessmentTai'an
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维普
