Detection method of online residual chlorine detector

The residual chlorine in the online residual chlorine detector 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 three forms of residual chlorine: 1. Total residual chlorine: including free residual chlorine and combined residual chlorine. 2. Free residual chlorine: including HOCl and OCl-, etc. 3. Compound residual chlorine: including NH2Cl, NHCl2, NCl3 and other chloramine compounds. The role of residual chlorine is to ensure continuous sterilization and also to prevent water from being re-polluted. However, if the amount of residual chlorine exceeds the standard, it may aggravate the odor produced by phenols and other organic substances in the water, and may also generate CHCl3 and other organic chlorinated substances with 'three causes' effects. Determining the content and state of residual chlorine in water is extremely important for doing a good job in drinking water disinfection and ensuring the safety of water hygiene. There are many methods for the determination of residual chlorine, mainly the following methods: 1. DPD colorimetric method: under the condition of PH6.2~6.5, ClO2 first reacts with DPD to form a red compound, but the amount of appearance only reaches its total available chlorine. one-fifth of the content. If the water sample is acidified in the presence of iodide, chlorite and chlorate also react, and when neutralized by the addition of bicarbonate, the resulting color corresponds to the total available chlorine content of ClO2 . The interference of free chlorine can be suppressed by adding glycine, based on the fact that glycine can immediately convert free chlorine into chloroaminoacetic acid, but it has no effect on ClO2. 2. The principle of the film-covered electrode method: the electrode is immersed in the electrolyte chamber, and the electrolyte chamber is in contact with water through a porous hydrophilic membrane. The hypochlorous acid diffuses into the electrolyte cavity through the porous hydrophilic membrane, and forms a current on the electrode surface. The magnitude of the current depends on the speed at which the hypochlorous acid diffuses into the electrolyte cavity, and the diffusion rate is proportional to the concentration of residual chlorine in the solution. Measure the magnitude of the current The concentration of residual chlorine in the solution can be determined. 3. The principle of the constant voltage electrode method: a stable potential is maintained between the measuring and reference electrodes, and different measured components will produce different current intensities under this potential. It consists of two platinum electrodes and a reference electrode to form a micro current measurement system. At the measuring electrode, chlorine molecules or hypochlorite are consumed, and the resulting current intensity is related to the concentration of residual chlorine in the water.
There are many issues that affect water quality monitoring device, which has led to the need of getting specialists trained in certain areas so as to handle all issues that may arise as well as water analyzer products that can solve water quality monitoring device problems.
Being a performance leader means Shanghai Boqu Instrument Co., Ltd. will achieve operational excellence, industry-leading customer satisfaction and superior financial performance.
water analyzer allows users to use in innovative ways that fit their individual needs, while at the same time providing cost-effective, reliable and user-friendly products.