摘要
本文提出了直流示波极谱滴定磷酸萃取液中常量磷的新方法:以Bi^(3+)为滴定剂滴定PO_4^(3-),用JP-2型示波极谱仪作检测器,根据滴定过程中铋波的出现来指示滴定终点的到达。方法简便、快速,结果准确度、精密度均符合容量分析的要求。
We have suggested a new method of direct current polarographic titration of phosphorus which is used to analyse the concentration of P_2O_5 in the manufacture of extract phosphoric acid. First PO_4^(3-) is precipitated with bismuth (Ⅲ), and then the terminal point of titration is determined according to the appearance of a sensitive and sharp wave of surplus Bi^(3+) by JP-2 oscillopolarographic instrument. The whole process can be finished in 15 min. The accuracy and precision of the method are satisfactory.
关键词
磷酸萃取液
磷
极谱滴定
铋
bismuth (Ⅲ)
direct current oscillopolarographic titration
phosphate ion
phosphoric acid extract
