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水及废水中化学耗氧量(COD)是还原性物质在一定的条件下被强氧化剂氧化时消耗的氧化剂所相当于氧的量。结果用1升水中还原性物质被氧化时消耗的氧化剂所相当
Chemical oxygen demand (COD) in water and wastewater is the amount of oxidant consumed by a reductant when oxidized by a strong oxidizer under certain conditions. The result is equivalent to the oxidant consumed when the reducing material in 1 liter of water is oxidized