Easy to use, no adverse health effects are found after long-term use. However, due to serious environmental pollution and serious pollution of water sources by various organic substances, people have discovered that after chlorination and disinfection of water, chlorine and organic hydrocarbons in the water form traces of carcinogenic halogenated hydrocarbon-trihalomethane compounds. There are four main types of these compounds: chloroform (CHCl3), bromodichloromethane.
Dibromochloromethane and bromoform (CHBr3). Someone used 477mg/L and 180mg/L of chloroform to conduct carcinogenicity tests on mice and rats, and found that they were carcinogenic. However, the actual content of chloroform in drinking water is so small that it does not pose a threat to humans, and the epidemiological investigation of the population has not found any relationship between drinking water chlorination disinfection and cancer.
Although the content of trihalomethane compounds in the water is very small and the carcinogenic dose to animals is high, environmental epidemiological investigations of people who drink this tap water have not found carcinogenic conclusions.
However, these compounds are still a potential hazard to humans. . Therefore, some countries have stipulated that the chloroform content in effluent water should not exceed 70-100μg/L, the United States stipulates that the content of trihalomethane compounds in drinking water should not exceed 100μg/L, and the chloroform content specified in China's drinking water quality standards is 60μg/L. The carbon chloride content is 3μg/L.