Introduction: Chemical Oxygen Demand (COD) is a necessary measurement item in surface water, industrial wastewater, domestic sewage and other water bodies. It is an important indicator reflecting the pollution status of water quality by oxygen consuming substances and is also one of the key indicators for implementing total emission control in the country. CODcr represents the chemical oxygen demand measured by the dichromate method. HJ 828-2017 Determination of Chemical Oxygen Demand in Water Quality - Dichromate Method is currently recognized as the most accurate and reliable testing method for determining chemical oxygen demand. The reflux digestion of water samples in this method is a process that requires strict temperature and time control. Poor mastery can lead to deviations in the analysis results. For industrial wastewater containing high concentrations of chloride ions, the chloride ions are easily oxidized by potassium dichromate, which affects the accuracy of the measurement results. Generally, COD determination is carried out according to the HJ/T 70-2001 Chlorine Gas Calibration Method for the Determination of Chemical Oxygen Demand in High Chlorine Wastewater. Technical parameters: Digestion method: reflux digestion Heating module: dual heating blocks Origin category: Domestic Batch processing volume: 6 Temperature range: 5-40 Temperature accuracy: ± 1.5 Digestion capacity: 700 Timing error: ± 1min
Introduction: Chemical Oxygen Demand (COD) is a necessary measurement item in surface water, industrial wastewater, domestic sewage and other water bodies. It is an important indicator reflecting the pollution status of water quality by oxygen consuming substances and is also one of the key indicators for implementing total emission control in the country. CODcr represents the chemical oxygen demand measured by the dichromate method. HJ 828-2017 Determination of Chemical Oxygen Demand in Water Quality - Dichromate Method is currently recognized as the most accurate and reliable testing method for determining chemical oxygen demand. The reflux digestion of water samples in this method is a process that requires strict temperature and time control. Poor mastery can lead to deviations in the analysis results. For industrial wastewater containing high concentrations of chloride ions, the chloride ions are easily oxidized by potassium dichromate, which affects the accuracy of the measurement results. Generally, COD determination is carried out according to the HJ/T 70-2001 Chlorine Gas Calibration Method for the Determination of Chemical Oxygen Demand in High Chlorine Wastewater.
