One article to understand the relationship between residual chlorine, total chlorine, total residual chlorine, freeness, chlorine and chlorine

Recently, the Ministry of Ecology and Environment issued the 'Emergency Monitoring Plan for Responding to Virus-Infected Pneumonia Epidemic' (hereinafter referred to as the 'Plan'). The 'Plan' clarifies the emergency monitoring work of the ecological environment during the epidemic prevention and control period. Among them, it is proposed to strengthen the early warning and monitoring of drinking water source water quality. During the epidemic prevention and control period, on the basis of routine monitoring of drinking water source, increase the monitoring of epidemic prevention and control characteristic indicators such as residual chlorine and biological toxicity, and intensify monitoring when abnormalities are found. Take measures in time to find out the cause, control the risk, eliminate the impact, and effectively protect the drinking water of the people. But many friends have encountered the same problem. They can't tell the relationship between residual chlorine, total chlorine, total residual chlorine, freeness, chlorine and chlorine. What is the relationship between total chlorine and total residual chlorine? What is the difference between residual chlorine and free chlorine? and chlorine in the form of dissolved elemental chlorine. Its synonyms are free residual chlorine, free residual chlorine, free chlorine, free residual chlorine. The opposite of free chlorine is combined chlorine, which refers to chlorine that exists in the form of chloramines and organic chloramines. Its synonyms are combined residual chlorine or combined residual chlorine. The total chlorine and the total residual chlorine are synonymous terms, which refer to the chlorine existing in the form of free chlorine or combined chlorine, or the coexistence of the two, which can be regarded as the sum of free chlorine and combined chlorine in water. To sum up, there are three indicators for chlorine disinfection related disinfectants: 1. Residual chlorine, synonym: free residual chlorine, free chlorine, free chlorine; 2. Combined chlorine, synonym: combined residual chlorine; 3. Total chlorine, synonym: total residual chlorine . For the same water sample, the relationship between the content of the three indicators: Residual chlorine + combined chlorine = total chlorine The function of residual chlorine is to ensure continuous sterilization and prevent water from being re-polluted. However, if the amount of residual chlorine exceeds the standard, it may aggravate the taste and odor produced by phenol and other organic substances in the water, and may also generate harmful substances such as chloroform."San Zhi"Functional organochlorides. Determining the content and state of residual chlorine in water is important for doing a good job in drinking water disinfection and ensuring water hygiene. There are many methods for measuring residual chlorine.
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