重铬酸钾法快速测定COD方法的改进

Improvement on Rapid Determination of COD by Potassium Dichromate

介绍了一种快速测定CODCr的方法。提出用35mL硫磷混合酸代替CODCr标准方法中30mL单一硫酸进行回流操作,氧化反应时间由2h缩短为20min。用该方法与标准方法分别测试了标准物质所配制的水样,结果表明两种方法间不存在显著性差异。本改进方法反应时间短、节约水电、结果准确,具有一定的可行性。

This essay introduces a rapid method to determine the amount of CODCr. It proposes to use 35 ml of the mixture of sulphuric acid and phosphoric acid to replace only 30 ml of snlphuric acid in the refluxed operation, and to shorten the time of oxidation reaction from 2h to 20min. It has proved that there is no marked difference between this improved method and standard method when determine water sample made up of standard material respectively. Meanwhile, this method is feasible in short reaction time, spare water and electricity and accurate results.