To determine COD in saline waters, you can not use the usual method with the mixture Potassium Dichromate+ Sulphuric acid, because chlorides can be oxidised with it, resulting a heavy interference. You must applied the method with potassium permanganate. I advise you to consult a collection of methods for sea water as Methods of Seawater Analysis. Editor(s): Klaus Grasshoff, Klaus Kremling, Manfred Ehrhardt.
Hoping my comment be useful for you
For the measurement of COD in sea water kindly refer :
Liu Li, and others 2005, Chemical oxygen demand of seawater determined with a microwave heating method Journal of ocean university of China, volume 4, issue 2, page 152-156.
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Please check the link and attachment.
https://www.researchgate.net/post/Is_there_any_specific_method_for_estimating_chemical_oxygen_demand_COD_at_a_chloride_concentration_of_1_50_000_ppm
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