Frequently Asked Questions in Chlorine Test Methods

The traditional residual chlorine test methods mainly include spectrophotometry and colorimetry. The disadvantages of these two methods are: more than 5 kinds of reagents and solutions are required, and the test accuracy is affected by the color and turbidity of the sample. Residual chlorine generally refers to the concentration of free chlorine (such as hypochlorite) in the 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 (general chlorine gas): 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, and the remaining chlorine is called residual chlorine. Why is it said that the electrode method is a very simple test method for residual chlorine? The traditional residual chlorine test methods mainly include spectrophotometry and colorimetry. The disadvantages of these two methods are: more than 5 kinds of reagents and solutions are required, and the test accuracy is affected by the color and turbidity of the sample. Moreover, these methods require professional experimenters to operate, the procedures are complicated and time-consuming, and it is difficult to test in the field and in the field. The electrode method test only needs one reagent tablet, and an ordinary person can operate it skillfully according to the instructions in a few minutes, and it is easy to carry, and the test result is not affected by the color and turbidity of the solution. Therefore, among the various methods of residual chlorine testing, the electrode method is the simplest and most accurate method. 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 an important process requirement in the disinfection of chlorine addition, and the test of the amount of residual chlorine is a direct reflection of this requirement.
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