The experiment shows that there is basically no difference in the residual chlorine content of water boiled in different ways. No matter which way water is boiled, it is not sealed and can be volatilized. After boiling, the residual chlorine content of water is greatly reduced.
It is suggested that the public do not need to worry about whether to burn it for a while or whether to open the lid. Even if it is boiled directly, it needs to be cooled in a cup, which is also a volatilization process. Therefore, as long as the tap water is qualified, no matter which way the water is boiled, the residual chlorine content in the water is within the safe range.
Tap water needs coagulation, sedimentation, filtration and disinfection in the production process, among which liquid chlorine disinfection is recognized as the most commonly used safe, economical, effective and mature disinfection method at home and abroad. Residual chlorine refers to the available chlorine left in water after chlorination and contact for a certain period of time.
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Yun Orfila, a doctor of food engineering and a member of the Scientific Squirrel Society, said that chlorine or chlorine dioxide is an economical and efficient disinfection scheme for tap water, which is widely used in many parts of the world. The World Health Organization's standard for residual chlorine in tap water is 5mg/L, but in fact, the residual chlorine content in tap water is controlled below 1mg/L or even lower.
According to the conventional indicators of drinking water disinfectants in China, the minimum residual chlorine content in the factory water is not less than 0.05mg/L, and the maximum limit is 4 mg/L. According to media reports, the residual chlorine content in the factory water of various water plants in Beijing is between 0.4 and 0.8 mg per liter of water, which will fade when transported to users' homes through the pipe network.
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