How to detect residual chlorine

Residual chlorine refers to the chlorine remaining in the water after the water has been in contact with the chlorine-based disinfectant for a certain period of time. There are many ways to detect residual chlorine, and the most common method is a portable residual chlorine detector, and the general detection time is about 3 minutes. Residual chlorine refers to the chlorine and residual chlorine remaining in the water after the water has been in contact with chlorine-based disinfectants for a certain period of time. There are three forms: total residual chlorine: including free residual chlorine and combined residual chlorine; free residual chlorine: including HOCl And OCl-, etc.; chemical residual chlorine: including NH2Cl, NHCl2, NCl3 and other chloramine compounds. The role of residual chlorine is to ensure continuous sterilization and prevent water from being re-polluted. However, if the amount of residual chlorine exceeds the standard, it may aggravate the taste and odor produced by phenol and other organic substances in the water, and may also generate harmful substances such as chloroform."San Zhi"It is extremely important to do a good job in drinking water disinfection and to ensure the safety of water hygiene. There are many methods for measuring residual chlorine, and the following three methods can be used: Portable DPD residual chlorine detector Application scope: This method is suitable for measuring free residual chlorine, total residual chlorine and Combined residual chlorine. If the water sample is colored or turbid, it can be used as a blank to adjust to zero to offset its influence. The maximum detection concentration of this method is 4.5mg/l available chlorine.
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