Write the short note on COD?
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COD means cash on delivery, a type of transaction in which the purchaser makes the payment only when the goods are delivered. The higher the chemical oxygen demand, the higher the amount of pollution in the test sample.
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chemical action demand is the amount of oxygen needed to oxidize the given matter present in water . chemical oxygen demand testing is used to determine the amount of organic matter in a water sample. for the contaminants that can be oxidize biologically here the biological oxygen demand (BOD) is also used.
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