Contents and health risk of disinfection by-products in drinking water in a district of Beijing during 2023-2024
Objective To understand the contents and health risk of disinfection by-products in drinking water in a district of Beijing.Methods The monitoring data of disinfection by-products in drinking water in a district from April 2023 to March 2024 were collected,and the health risk assessment was carried out according to the Technical Guide for Environmental Health Risk Assessment of Chemical Exposure(WS/T 777-2021).Results Totally 288 samples of terminal water were collected,the median concentrations of chloroform,dibromochloromethane,bromodichloromethane,tribromomethane,dichloroacetic acid and trichloroacetic acid were 2.87×10-2 mg/L,1.3×10-3 mg/L,5.0×10-3 mg/L,4.0×10-3 mg/L,5.0×10-3 mg/L and 5.0×10-3 mg/L respectively,with a qualified rate of 100％.Except for dichloroacetic acid,the contents of chloroform,dibromochloromethane,bromodichloromethane,tribromomethane and trichloroacetic acid in the terminal water during the wet season were all higher than those in the dry season,with significant differences(P＜0.05).The cumulative carcinogenic risk of disinfection by-products was between 8.79 ×10-6-3.35 ×10-5,and the non-carcinogenic risk was 0.02-0.08,all of which were within the acceptable range.Chloroform had the highest carcinogenic risk contribution ratio.Conclusion The health risk exposed to disinfection by-products in drinking water in a district of Beijing is within the acceptable range.Chloroform has the highest carcinogenic risk contribution ratio,the priority to the control of this substance should be given.
Drinking waterHealth risk assessmentDisinfectant by-productsMonte Carlo simulation
NETL
NSTL
万方数据
