Detection method of residual chlorine in water quality after sewage treatment

Sewage refers to the effluent water from domestic and production that is polluted to a certain extent. Water that has lost its original function is simply called sewage. It is mainly the water after daily use, which contains more organic matter and is easier to handle. Chlorine or some chlorine compounds are commonly used for disinfection when treating drinking water. Sometimes chlorine gas is used to oxidize seriously polluted raw water to improve water quality. At this time, the residual chlorine is often measured to control the treatment process. What is the detection method of residual chlorine in sewage? Water quality residual chlorine detection method 1. DPD method: In a weakly acidic solution with pH6. It is reduced to Cl-, and the red color disappears. The method is relatively simple and the determination result is relatively accurate, and is suitable for determining drinking water and industrial water with a determination range of 0.03-5 mg/L. 2. N, N-diethyl-p-phenylenediamine spectrophotometry: In a solution with a pH of 6.2 to 6.5, free chlorine can directly react with N, N-diethyl-p-phenylenediamine, and the product is a red Compounds can be measured colorimetrically at 510nm. This method has high sensitivity and is suitable for the determination of drinking water and industrial wastewater with a residual chlorine content of about 0.05-1.5 mg/L. 3. Iodometric method: Residual chlorine reacts with potassium iodide in an acidic medium to form elemental iodine. The measurement result by this method is more accurate, the measurement result is the total residual chlorine, which is mainly used to determine the total residual chlorine in domestic water, and the lower limit of determination is 1mg/L. It is suitable for the determination of drinking water with residual chlorine in the range of 0.01-10mg/L. The residual chlorine/total chlorine detector is based on the principle of DPD (N,N-diethyl-p-phenylenediamine) method, and complies with the national standard GB/5750.11-2006. It is suitable for the determination of the concentration of free residual chlorine (the product is referred to as 'residual chlorine') or total residual chlorine (the product is referred to as 'total chlorine') in various water bodies that are disinfected with chlorine.

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