Chemical Oxygen DemandIt refers to the measurement of the amount of reducible substances that need to be oxidized in water samples by chemical methods. It is an important and quickly measurable organic pollutant parameter, often represented by the symbol COD.
CODCOD is one of the important indicators for measuring the degree of water pollution, and almost all water quality monitoring will measure COD, which is a monitoring module in water quality testing. Non environmental professionals can simplyCODIf the concentration of organic pollutants in the water exceeds the standard, that is to say, if the COD exceeds the standard, it can be considered as an excessive concentration of organic matter. Because COD reflects the concentration of reducible substances (things that can be oxidized) in water, and most of the reducible substances in water are organic matter, with a small portion being reducible salts.
Under normal circumstances,COD exceeds the standardIt's not a big deal. In fact, the water quality of many rivers does not meet the corresponding standards. So, if you see COD exceeding the standard, please don't be too nervous.
There is no single indicator that can explain the pollution situation of water quality, because this is not a single indicator, but a collection of all indicators, and any one exceeding the standard is not allowed. In the "Environmental Quality Standards for Surface Water" (GB 3838-2002), the basic items include copper, zinc, arsenic, mercury, cadmium, lead, chromium (hexavalent), fluoride, volatile phenols, etc. All of these are toxic and harmful. If a single item exceeds the standard, the water quality will be considered unqualified.
Yushan Sensor UV254 COD SensorNo need for reagents, no pollution, more economical and environmentally friendly. Can conduct long-term online water quality monitoring. The sensor integrates a turbidity detection light source internally, which can automatically compensate for the interference of turbidity in the tested water body. The sensor is equipped with an automatic cleaning brush device, which ensures stability even during long-term monitoring.