noun
chemical oxygen demand; COD
Technical term used in environmental chemistry and water quality analysis. Often abbreviated as COD.
この河川の化学的酸素要求量は基準値を超えている。
The chemical oxygen demand of this river exceeds the standard value.
化学的酸素要求量は水質汚濁の指標の一つです。
Chemical oxygen demand is one of the indicators of water pollution.