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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Hach's USEPA-approved dichromate COD Method is the most widely used chemical oxygen demand (COD) method for NPDES reporting in the world.
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In People's Republic of China, Hong Kong, and Macau, contact: HACH CHINA. Room 301, Scitech Tower. #22 Jianguomen wai Avenue. Beijing, P.R. CHINA.
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