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E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

Function and detection standard of residual chlorine in tap water

by:BOQU     2023-04-07
The residual chlorine in tap water is the residual amount after the tap water plant adds chlorine disinfectant to the water before the water comes out. The purpose of adding disinfectants to water is to kill microorganisms in tap water and tap water pipe networks, thereby preventing the spread and prevalence of water-mediated infectious diseases. The residual chlorine in tap water is mainly to eliminate algae and coliform bacteria. my country's sanitary standards for drinking water stipulate that the free residual chlorine content of the centralized water supply factory should not be lower than 0.3mg/L, and the unsputtered water of the pipe network should not be lower than 0.55mg/L, which is not harmful to the human body. First of all, residual chlorine can effectively sterilize tap water, but at the same time, the residual chlorine residual is not well controlled, and there is a problem of excessive excess. For your own health, please pay attention. Secondly, residual chlorine will produce serious disinfection by-products, which have a terrible tendency of carcinogenesis and mutagenesis, and have hidden dangers to the health of drinking water. Drinking water safety is of great importance, water quality determines blood quality, blood quality determines health, and water quality issues are concerned for the sake of health. Precautions for the use of residual chlorine detector: 1. Chloride ion is not the measurement category of residual chlorine. Chlorine measurement includes the measurement of free chlorine and combined chlorine content. 2. For the determination of free chlorine, the pH must be 6.2-6.5, and the DPD reagent should be added for direct reaction to generate a red compound. If the pH value is out of range, please adjust it with buffer reagent or dilute acid or dilute alkali. 3. The principle of the method for measuring total chlorine: when the pH is 6.2-6.5, add excess potassium iodide, add DPD to react directly, and generate a red compound. If the pH value is out of range, please adjust it with buffer reagent or dilute acid or dilute alkali. 4. The turbid sample must be filtered before measurement. 5. It cannot be measured for colored samples.
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