Significance and Common Sense of Residual Chlorine in Water

Residual chlorine is one of the most special detection indicators in tap water, because it is a substance added to tap water artificially, and it is a substance that must be added but cannot be added in excess. Its main function is to inhibit the number of bacteria in the process of water delivery, which will be consumed over time. However, in actual situations, due to various situations, the residual chlorine in tap water will disappear or be too high, causing water trouble. Because the pipe network is too long or the pollution is serious, the residual chlorine in tap water will disappear too quickly, and it will not have the effect of inhibiting bacteria. At this time, it needs to be added artificially, and often due to the lack of necessary detection tools in the process of adding, Adding based on personnel experience will cause excessive residual chlorine. The most direct problem when residual chlorine is excessive is that the water has a strong chlorine smell. In addition, some organic matter in the water may chemically react with residual chlorine to form toxic and harmful chemicals. At the same time, in industrial water treatment, excessive residual chlorine will accelerate the damage of water treatment equipment and increase production costs. Whether it is in domestic life or industrial application, as long as tap water is drawn, the detection of residual chlorine is necessary. Since residual chlorine is a basic indicator of tap water, its detection method is relatively complete, and a complete detection method is provided in GB5750-2006. At the same time, since residual chlorine detection is a basic water quality indicator of tap water, it is of great significance. A variety of detection tools are also provided, including instruments, kits, test strips, etc. Users can choose different products according to actual needs and measurement ranges. Why is it said that the electrode method is the simplest 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 effective 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 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.