E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

The role of residual chlorine in water quality testing

by:BOQU     2023-04-06
While advocating individuals, the country is also strictly controlling the spread of various pollution channels. The step of water disinfection is essential, and the residual chlorine content after disinfection must also be strictly tested and qualified. What is the indicator of residual chlorine? 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 general term for free chlorine and combined chlorine remaining in water after a certain period of contact with chlorine after being added to water. Therefore, today I would like to introduce to you how much the country attaches importance to the residual chlorine indicator. As early as 2003, the Ministry of Environment of the People's Republic of China took the residual chlorine index as a reference index in the standard management method for the collection of sewage charges. PH value, chromaticity, number of coliform bacteria, residual chlorine pollution equivalent value 1. Only one item is collected for the number of coliform bacteria and total residual chlorine. 2. PH5-6 refers to greater than or equal to 5, less than 6; PH9-10 refers to greater than 9, less than or equal to 10, and so on. The control concentration of residual chlorine in the cold drainage of each project shall not exceed 0.2 mg/L. So, what harm will the excess chlorine in the water have on the human body? 1. Residual chlorine is very harmful to the human body. It can irritate the eyes, nose, and respiratory tract above the throat, etc., causing acute pulmonary edema. When the concentration is high, it can paralyze the nerves in the central area of ​​breathing. Long-term inhalation of low concentrations of chlorine can cause chronic poisoning. Chlorine, when added to water, can bleach your skin, peel off layers of skin and develop allergies. When chlorine is heated, it produces carcinogens such as chloroform. 2. What is the impact of tap water containing residual chlorine on washing vegetables and fruits? Chlorine will destroy vegetables, fruits, vitamins, minerals and other nutrients in grains, seriously affecting the absorption of nutrients by the human body. 3. What are the dangers of taking a bath with water containing residual chlorine for a long time? Taking a bath with tap water containing residual chlorine, 40% of the total amount of chlorine in the bathroom is inhaled through the respiratory tract, and 30% is absorbed by the skin, which is the chlorine that enters the human body through drinking 6 to 8 times of that, mild cases will produce itching, and severe cases will increase the risk of cancer by 30%. In summary, residual chlorine control is a necessary measure.
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