Comparative Study of Two Methods of COD Determination in Environmental Monitoring
Chemical oxygen demand(COD)in environmental monitoring is a key index to assess the degree of organic pollution in wastewater.In this study,two commonly used methods for COD determination were compared:traditional potassium dichromate method and rapid spectrometry.The principle,advantages and disadvantages of the two methods are analyzed.The results show that the traditional potassium dichromate method has high accuracy,but the operation is cumbersome,time-consuming and harmful to the environment.Rapid spectroscopy is easy to operate,fast and suitable for rapid field monitoring,but it is interfered by other substances.This study provides a scientific basis for the selection of COD determination methods in the field of environmental monitoring.