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IS 3025-58 (2006): Methods of sampling and test (physical and chemical) for water and wastewater, Part 58: Chemical oxygen demand (COD) [CHD 32: Environmental Protection and Waste Management] Learn how to determine the COD in waste water to know the pollution quantity in water by the titration method using Ferrous ammonium sulfate and Ferroin solution as indicator. 1.1 When the chloride level exceeds 1000 mg/L the minimum accepted value for the COD will be 250 mg/L. COD levels which fall below this value are highly questionable because of the high chloride. The document is an effluent testing laboratory manual from Chandpur Enterprises Ltd., providing detailed methodologies for testing various water and wastewater parameters such as BOD, COD,.