Significance and Detection of residual chlorine in Water
Residual chlorine is one of the special detection indexes in tap water because it is a substance added specially to tap water by an individual. It is a substance that needs to be added but cannot be overdosed. Its main role is to suppress the amount of bacteria that will be consumed over time. However, in practice, chlorine in tap water will disappear or be too high because of various and sample conditions, causing water trouble. Because the pipe network is too long or polluted seriously, the residual chlorine in the tap water will disappear too quickly and will not play the role of bacteriostasis. At this time, it is necessary to add it artificially, but often in the process of supplementation, due to the lack of necessary testing tools, it is added according to the personnel experience. In addition, the presence of some organic compounds in the water may result in chemical reactions with residual chlorine to produce toxic and harmful chemicals. At the same time, in the treatment of industrial water, Excessive residual chlorine speeds up the damage to water treatment equipment and increases production costs. The detection of residual chlorine is necessary as long as it reaches tap water, both in domestic and industrial use. As residual chlorine is a basic index of tap water and its detection method is relatively perfect, it provides a complete detection method in GB5750-2006. At the same time, as residual chlorine detection is a basic index of self-water quality, it is of great significance. The market also provides a variety of testing tools, including instruments, kits, test strips, users can choose different products according to actual needs and measurement range. Note: residual chlorine and total chlorine free residual chlorine: also called free residual chlorine in free chlorine aqueous solution, it is a kind of residual chlorine component with good antivirus effect and strong oxidation in water. When there is ammonium (amine, ammonia) in water, Chlorine reacts with ammonium to produce chloramines (chloroamine, dichloroamine, trichloramine). The bactericidal efficacy of chloramine is much weaker than that of hypochloric acid and has a peculiar smell. Total residual chlorine: free residual chlorine and combined residual chlorine are commonly referred to as "residual chlorine" and "Total chlorine" refers to total residual chlorine, and "Total chlorine" refers to a measuring instrument for total residual chlorine: it is generally used for rapid detection of residual chlorine by electrochemical or spectrophotometric methods. Its accuracy is high, basically is similar to the traditional laboratory analysis method, but more simple and easy to use. Residual chlorine test box: a class of products extended from the standard method. By means of colorimetric method, residual chlorine in water is determined by the reaction of residual chlorine in water with a special chemical. This type of product can be tested at a lower limit of 0.05 mg / L, satisfying the needs of the average household and industrial user: it will have a larger detection range than the residual chlorine test box, but the accuracy will be lower than that of the residual chlorine test box. The usage is similar to that of PH test paper. If the requirement of the user is high, the residual chlorine detector can be selected, which can also be used as the consumer or the general industrial site user to choose the low cost residual chlorine detection box.