Chemical Oxygen Demand (COD)
Chemical oxygen demand (COD) is a measure of the ability of chemical reactions to oxidise matter in aqueous system. The results are expressed in terms of oxygen so that they can be compared directly to the results of biochemical oxygen demand (BOD) testing. The test is performed by adding the oxidising solution to a sample, boiling the mixture on a refluxing apparatus for two hours and then titrating the amount dichromate remaining after the refluxing period. The amount of dichromate reduced during the test the initial amount minus the amount remaining at the end is then expressed in terms of oxygen.
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