Sanitary monitoring results and health risk of 13 chemicals in drinking water in Shenzhen in 2022
Objective To know the hygienic status of 13 chemicals drinking water in Shenzhen in 2022 and the health risks to the people.Methods Monitoring points were set up throughout the city to conduct the hygienic monitoring of drinking water during the wet seasons which was from April to September and dry seasons including January to March and October to December.Using the classic"four step"health risk assessment model of the US Environmental Protection Agency to evaluate the carcinogenic or chronic non carcinogenic risks of 13 chemicals in water,and the stratification analysis of health risks of different genders,water sample types,water period types,water source types and disinfection methods were conducted.Results The carcinogenic risk of trichloromethane exposure through drinking water by the general population in Shenzhen ranges from 10-6 to 10-4,indicating a potential carcinogenic risk.The risk of various chemical indicators was generally higher in women than in men.The carcinogenic risk of trichloromethane was significantly higher in terminal water and secondary water supply than in the finished water,significantly higher in wet season than in dry season,and decreased sequentially in lakes,reservoirs and rivers.The carcinogenic risk of trichloromethane in water disinfected with liquid chlorine and sodium hypochlorite ranges from 10-6 to 10-4,and the risk of liquid chlorine disinfection was higher than that of sodium hypochlorite disinfection.The chronic non carcinogenic risks were all less than 1,which was within an acceptable range.Conclusion The drinking water in Shenzhen may have certain carcinogenic risks in 2022,with trichloromethane being the main risk indicator and the management and monitoring should be strengthened.
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