How to detect residual chlorine in tap water

Residual chlorine means that after chlorine is put into water, in addition to consuming a part of the chlorine through the interaction with bacteria, microorganisms, organic matter, inorganic matter, etc. in the water, there is still a part of chlorine, called residual chlorine. Residual chlorine can be divided into combined residual chlorine (referring to the compounds of chlorine and ammonia in water, including NH2Cl, NHCl2 and NHCl3, NHCl2 is relatively stable and has a good bactericidal effect), also known as combined residual chlorine; OC1+, HOCl, Cl2, etc. in water are bactericidal Fast speed, strong bactericidal power, but disappears soon), also known as free residual chlorine. Residual chlorine is the sum of combined residual chlorine and free residual chlorine. Residual chlorine in tap water refers to the detection of free residual chlorine on bacteria in tap water, and the results cannot be obtained immediately, and the number of bacteria in tap water is inversely proportional to the residual chlorine content, so the determination of residual chlorine in tap water can be used as a measure. Water disinfection effectiveness and signals indicating recontamination of tap water. Especially necessary for long pipe networks, dead ends and old equipment. Therefore, residual chlorine is an important indicator to ensure the continuous sterilization ability of chlorine gas and prevent external pollution. When the residual chlorine is kept at 0.5mg/L, it not only has a complete killing effect on typhoid fever, dysentery, leptospirosis, Brucella, etc., but also has a strong effect on enteroviruses such as infectious hepatitis and poliovirus. killing effect. killing effect. When the chlorine content in the tap water is too low, the tap water will be polluted again and cannot meet the water quality requirements. It is unpalatable and unpalatable, and it will cause discoloration when washed with water after dyeing. It also affects the aquaculture industry and households that keep goldfish. my country's 'Drinking Water Hygienic Standards' stipulates that the chlorine content after 30 minutes of contact with water should not be lower than 0.3mg/L. In addition to plant water, centralized water supply should meet the above requirements, and the water at the end of the pipe network should not be lower than 0.05mg/L.
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