What is the electrode method test of residual chlorine

Free chlorine generally refers to the concentration of free chlorine (such as hypochlorite) in solution, not the concentration of chloride ions. So residual chlorine and chloride ion are two different meanings. The amount of chlorine added in water treatment: one part is the actual consumption of chlorine, that is, this part of chlorine is consumed in the process of killing bacteria and microorganisms in water and reacting with organic matter, and the other part is the remaining chlorine , the remaining amount of chlorine is called residual chlorine. Chlorination disinfection requires a certain concentration of residual chlorine in the water, because it can inhibit the re-reproduction of residual bacteria in the water, maintain continuous bactericidal ability, and prevent water pollution. However, if the amount of residual chlorine is too large, it will also irritate people's skin, increase the production cost, and produce harmful compounds to the human body and the environment. Therefore, the control of the amount of chlorine added is the control of the amount of residual chlorine, which is the most important process requirement in the disinfection of chlorine addition, and the test of the amount of residual chlorine is the most direct embodiment of this requirement. The electrode method is the simplest test method for residual chlorine. It only takes a few minutes for an ordinary person to operate proficiently according to the instructions. It is easy to carry and the test results are not affected by the color and turbidity of the solution. .