【摘要】 例行监测中CODCr的测定 ,采用重铬酸钾法[1 ] ,此方法测定准确可靠 ,但回流时间较长 ,耗水、耗电、耗时 ,分析速度慢。本方法改用硫磷混合酸代替硫酸 硫酸银溶液进行回流操作 ,极大地缩短了回流时间 ,提高了分析速度并能得到满意结果。更多还原

【Abstract】 The potassium dichromate method is used to measure COD Cr in the routine monitoring.The determination by this method is precise and reliable,yet its reflux time is longer,as well as water, power and time-consuming.Therefore,when using this method, the solution of sulfuric acid-silver sulfate is replaced by that of sulfuric acid-phosphoric acid to carry out refluxing operation,which shortens the time of reflux remarkably and accelerates the analysis with satisfactory results.更多还原