磷酸萃取液中磷的直流示波极谱滴定

来源期刊：中南大学学报(自然科学版)1991年第2期

论文作者：陈晓青 黄宋献

文章页码：215 - 221

关键词：铋(Ⅲ); 直流示波极谱滴定; 磷酸根; 磷酸萃取液

Key words：bismuth (Ⅲ); direct current oscillopolarographic titration; phosphate ion; phosphoric acid extract

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Bi³⁺为滴定剂滴定PO₄^3-,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。

Abstract: We have suggested a new method of direct current polarographic titration of phosphorus which is used to analyse the concentration of P₂O₅ in the manufacture of extract phosphoric acid. First PO₄³is 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 Bi³⁺ by JP-2 oscillopolarographic instrument. The whole process can be finished in 15 min. The accuracy and precision of the method are satisfactory.