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There are several main forms of residual chlorine in water

by:BOQU     2023-04-06
The residual chlorine detector is a commonly used water quality testing instrument, which can effectively detect the residual chlorine content in industrial wastewater, drinking water, swimming pool water, medical sewage and other water bodies. However, there are many forms of chlorine in water bodies, mainly including three forms of total residual chlorine, free residual chlorine and compound residual chlorine. Residual chlorine: Residual chlorine (residual chlorine), commonly known as bleaching powder, is the general term for free chlorine and combined chlorine remaining in water after being chlorinated and disinfected for a certain period of time. After chlorine is put into water, in addition to consuming part of the amount of chlorine by the action of bacteria, microorganisms, organic matter, and inorganic matter in the water, the remaining part of the amount of chlorine is called residual chlorine. Combined residual chlorine: Also called combined residual chlorine, it refers to the compound of chlorine and ammonia in water. There are three types: NH2Cl, NHCl2 and NHCl3. NHCl2 is more stable and has a better bactericidal effect. Free residual chlorine: also known as free residual chlorine, refers to OC1+, HOCl, Cl2, etc. in water, which has a fast sterilization speed and strong bactericidal power, but disappears quickly. The total residual chlorine is the sum of combined residual chlorine and free residual chlorine. Bacteria in tap water cannot be tested immediately, and the number of bacteria in tap water is inversely proportional to the amount of residual chlorine. Therefore, the determination of residual chlorine in tap water can be used to measure the effect of water disinfection and to indicate that tap water is polluted again. signal of. It is especially necessary for the situation where the pipe network is long, there are dead water ends and the equipment is outdated. Therefore, residual chlorine is an important indicator to ensure the continuous sterilization ability of chlorine 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, Leptospira, Brucella, etc., but also has a killing effect on enteroviruses, such as infectious hepatitis and poliovirus. Killing effect. When the chlorine content in the tap water is too low, the tap water will be polluted again, making it unable to meet the water quality requirements; but when the chlorine content in the tap water is too high, the amount of chlorine will be wasted, and the chlorine smell in the water will be too strong. It is unpalatable and unpalatable, and it can cause decolorization when dyed and washed after printing and dyeing. It also affects the aquaculture industry and has an impact on family raising goldfish. my country's 'Drinking Water Hygienic Standards' stipulates that chlorine should not be lower than 0.3mg/L after 30 minutes of contact with water, and centralized water supply should not be lower than 0.05mg/L except that the factory water should meet the above requirements.
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