What problems should be paid attention to in the implementation of the residual chlorine detector specification?

Residual chlorine refers to the effective chlorine remaining in the water after the water has been chlorinated and disinfected for a certain period of time. The residual chlorine detector is usually used in food and beverage, medical and sanitation, CDC, tap water supply, secondary water supply, swimming pool, breeding and other industries. Residual chlorine refers to the chlorine remaining in the water after the water has been chlorinated and disinfected for a certain period of time. There are three forms of residual chlorine: free residual chlorine, combined residual chlorine and total residual chlorine. Residual chlorine is a routine test item in water quality testing. In addition to drinking water, the country has strict regulations on the discharge of total residual chlorine in hospital sewage. The residual chlorine detector has the characteristics of accurate quality, high sensitivity, and convenient use. Therefore, this type of instrument is widely used in water plants, hospitals, and sanitation systems, and plays an important role in water quality monitoring. However, at present, there are neither industry standards nor national standards for the calibration of such instruments. Each testing laboratory calibrates such instruments by self-calibration. Technical requirements, calibration conditions, calibration items, calibration methods, and calibration results are handled differently. The purpose of formulating calibration specifications for residual chlorine detectors is to provide a technical basis for the calibration of such instruments, which can improve the quality of residual chlorine detection, establish a traceability system for the value of residual chlorine detection, effectively evaluate the performance of instruments, and provide a basis for accurate monitoring of residual chlorine in water bodies. Provide guarantees so that various laboratories engaged in the testing of such instruments can better provide objective, comparable and effective testing data for scientific research, social and economic construction and development. Issues that should be paid attention to in the implementation of residual chlorine detector specifications: 1. Selection of terminology and measurement units 2. Principles for determining measurement characteristics 3. Principles for selection of standard substances Reference materials, these two reference materials are certified reference materials issued by Shanghai Institute of Metrology and Testing Technology, easy to obtain and traceable. Appropriate standard materials can be selected according to actual operation needs. During the calibration process, the operation instructions of the residual chlorine meter should be strictly followed, and the measurement can only be carried out after adding the matching reagents to complete the color development. 4. Uncertainty evaluation of indication error Taking total residual chlorine and free residual chlorine as examples, the uncertainty evaluation of indication error is carried out. The concentration value of the diluted standard solution was directly measured by the residual chlorine detector, and compared with the theoretical calculation results of the standard solution.
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