chemical oxygen demand (COD)


A method for testing water quality by measuring the amount of organic compounds, or pollution, in a sample of water taken from a lake or river. COD measures the amount of oxygen consumed by contaminants in a solution of boiling potassium dichromate. Expressed as parts per million, the higher the COD of the sample, the higher the level of pollution.

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You should try and use the chemical oxygen demand if you want to make sure you aren't polluting the environment

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The chemical oxygen demand was important because it would measure certain things and test things that needed to be tested.

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The water treatment facility began to wonder about the new company up the river when the chemical oxygen demand tests on their water samples started to show that the level of pollution in the water was going up.

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