化学需氧量计算方法的改进

Improvement of Method of Caculating Chemical Oxygen Demand

用测定空白蒸馏水化学需氧量代替硫酸亚铁铵标准溶液 ,方法省时、方便 。

Determination of COD of blank distilled water substitute for fixing ferrous ammonium sulfate standard solution, the method is time-saving, convinient and reliable.