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chemical oxygen demand
environ., chem.	χημικώς απαιτούμενο οξυγόνο
med.	χημική απαίτηση σε οξυγόνο
chemical oxygen demand The quantity of oxygen used in biological and non-biological oxidation of materials in water; a measure of water quality
environ.	χημικά απαιτούμενο οξυγόνο