Adding chlorine ions to daily drinking water can play a role in disinfection and sterilization, especially in order to ensure the safety of drinking water for residents, water plants will retain some
residual chlorine after sufficient sterilization, so that the water body can continue to sterilize. This appropriate residual chlorine is called residual chlorine, or active chlorine. In daily drinking water, this residual chlorine can be divided into three forms: free residual chlorine, combined residual chlorine, total residual chlorine, etc. . Addition standard of residual chlorine in drinking water During the disinfection process of drinking water, the amount of liquid chlorine added to the water is determined by the amount of excess chlorine in the water and the form of residual chlorine. If the amount of added chlorine is too small, the disinfection cannot be achieved. If too much can be added, it will not only cause waste, but also cause peculiar smell in the water body and affect the overall quality. Therefore, in the drinking water quality standard, it is stipulated that after adding chlorine for 30 minutes, the free chlorine in the water should not be lower than 0.3mg/L, and the centralized water supply should meet the above requirements except that the factory water should meet the above requirements, and the residual chlorine in the water at the end of the pipe network should not be lower than 0.05mg/L, so as to effectively prevent the pollution encountered when water is transported through the pipe network. The detection method of residual chlorine in drinking water is relatively low in drinking water in actual life, so the spectrophotometric method is used in the detection, and the minimum mass is 0.1 μg when measured with diethyl-p-phenylenediamine. Water samples are tested, and the minimum concentration of residual chlorine is 0.1mg/L. In addition, diethyl-p-phenylenediamine will quickly react with free residual chlorine in water and turn red. Under the catalysis of iodide, trichloramine can also react with DPD to develop color, so when adding iodide before adding DPD reagent, the concentration of trichloramine can be measured by changing the order of adding reagents. Precautions when detecting residual chlorine 1. During the detection of residual chlorine, when adding the DPD reagent, cover the rubber cover and shake it sufficiently to dissolve the reagent; 2. Before inserting the colorimetric bottle into the tank, the surface must be wiped clean, and it must be static for 30 3. The colorimetric bottle must be locked in the slot to position the colorimetric bottle and prevent stray light from entering; 4. In order to ensure the measurement accuracy, zero adjustment and measurement The sample should use the same colorimetric bottle; 5. The colorimetric bottle and rubber stopper must be cleaned immediately after the measurement to prevent contamination and corrosion of the colorimetric bottle; 6. If solid or solution enters the colorimetric bottle tank, it must be wiped clean before cleaning. Put into the colorimetric bottle;
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