Determination of COD
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In inorganic circulating water systems, is it better to use potassium permanganate or potassium dichromate for testing?
Methods for COD determination include the potassium dichromate method, the Coulomb method, and other analytical techniques. You can consult relevant monitoring books; I recommend reading \"Methods for the Monitoring and Analysis of Water and Wastewater\" (4th edition). The book can be found online
There are two methods for determining chemical oxygen demand: the potassium dichromate method and the acidic potassium permanganate method. The potassium dichromate method is commonly used for the analysis of industrial wastewater. For natural water bodies, the acidic potassium permanganate method is commonly used. Since potassium dichromate has a stronger oxidizing power than potassium permanganate, the value for the former is usually higher than that of the latter. From the perspective of regular discharge of circulating water, I personally believe that the potassium dichromate method is more reasonable.
The potassium dichromate method is recommended; this is what we use