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buy economical 15mL chemical oxygen demand vials factory supplier Chemical Oxygen Demand (COD) Testing Kits | CHEMetrics A COD test typically involves digestion of a water sample in a sealed vial with potassium dichromate and sulfuric acid at 150oC for 2 hours.

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COD describes the amount of oxygen required to chemically break down pollutants, while BOD indicates the amount of oxygen required to break down organic pollutants biologically with microorganisms. There is a correlation between COD and BOD, however, it must be experimentally established before using one parameter to express another.

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