硝酸铈法测定次磷酸及亚磷酸的含量

Cerium Nitrate Method for Determining the Content of Hypophosphorous Acid and Phosphorous Acid

为了测定含磷溶液中次磷酸或亚磷酸,探究用以硝酸铈铵为氧化剂的测定方法,先用过量的硝酸铈铵依次来氧化亚铁、次磷酸,再用硫酸亚铁铵溶液与过量的硝酸铈铵刚好定量发生氧化还原反应,最后根据消耗的硝酸铈铵和硫酸亚铁铵计算亚铁、次磷酸、亚磷酸的质量分数。实验表明,硝酸铈法能快速准确测出亚铁、次磷酸、亚磷酸的含量且灵敏度高。

Objective to explore the measurement time by cerium nitrate method the accuracy of phosphoric acid, phosphorous acid and ferrous ions content. Method of ammonium cerium nitrate oxidant in turn to ferrous oxide and phosphoric acid, phosphorous acid in accordance with the order of the material reducing gradually, and then, excessive oxidation of REDOX reaction of ammonium ferrous sulfate solution, according to the reaction equation and data calculation, phosphate, ferrous phosphlte quality score. Conclusions cerium nitrate method can accurately measure ferrous, phosphoric acid, phosphorous acid content and spirit of tall lightness.