If all major resources in the environment are damaged, causing problems in ecological balance, it is very difficult to restore without a long period of maintenance. In severe cases, it may even be impossible to restore. Therefore, protecting the environment and maintaining ecological balance are things that each of us must do. For some enterprises, it is urgent to carry out water quality monitoring work. This article mainly aims to introduce the COD online analyzer used for wastewater monitoring together with everyone.

COD (Chemical Oxygen Demand) refers to the amount of oxygen required for the oxidation of substances that can be oxidized in wastewater by chemical oxidants. It is a common method mainly used to detect the content of organic matter in water. In the process of COD analysis, two commonly used oxidants are potassium permanganate and potassium dichromate. However, the COD-8000 – COD online analyzer produced by Hangzhou Modi uses potassium dichromate for high-temperature digestion and colorimetric determination. When wastewater is heated to boiling with strong acid and then recycled, organic matter is oxidized. When silver sulfate is used as a catalyst, the oxidation rate of most organic matter can be increased to about 85% to 95%. If there is a high concentration of chloride ions in the wastewater, mercuric sulfate can be used to shield the chloride ions at this time, which can reduce the interference to COD monitoring. In addition, as there are many kinds of organic substances in the wastewater, monitoring and analysis will require a lot of time and chemicals. Monitoring COD to determine organic matter in water is a relatively common method.