In the 1990s, formaldehyde was rarely mentioned in drinking water, and there was no index of formaldehyde in the old drinking water sanitation standard. However, the water environment pollution is increasingly serious. Formaldehyde in drinking water has attracted more and more attention. Formaldehyde index is added to the newly issued drinking water sanitation standard, and the limit value is 0.9mg/l.
Formaldehyde is a colorless and irritant gas, which is mainly used to produce urea formaldehyde resin, phenols and melamine; it is also used to produce cosmetics, antimicrobials and textile preservatives. Formaldehyde in water mainly comes from industrial wastewater. Formaldehyde in drinking water is mainly produced by natural organic compounds in raw water disinfected by ozone or chlorine. The concentration of formaldehyde in ozonized drinking water can be up to 30 μ M / L, which can also be released from polyformaldehyde plastic bag unit. The physical and chemical properties of formaldehyde show that it is unlikely to evaporate from water, so the possibility of contacting formaldehyde through shower is very small.
According to the data released by the World Health Organization in 2005, this study conducted a two-year experiment on formaldehyde poisoning in drinking water of rats. It was found that formaldehyde had a pathological effect on the oral and gastric mucosa of rats, and the allowable concentration of formaldehyde in drinking water was inferred as 2.6mg/l. The international agency for research on cancer lists formaldehyde as a class 2A carcinogen.
According to China's 2001 drinking water quality and hygiene standard, the limit of formaldehyde in drinking water is 0.9mg/l. In view of the rapid development of ozone disinfection of drinking water in China, the Ministry of health still adopted the ozone disinfection limit when revising the drinking water sanitation standard in 2006.
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