氟离子选择电极法测定磷酸氢二钠中氟化物

Determination of Fluorine Content of Disodium Phosphate by Method of Fluoride Selective Slectrode

用氟离子选择电极法测定磷酸氢二钠中氟含量,控制溶液pH值5.0～7.0,加入柠檬酸钠缓冲溶液,消除铝、铁等离子的干扰,用直角坐标系或半对数坐标系进行定量,标准偏差3.3%,回收率98.4%～100.6%。

The fluorine content of disodium phosphate was determined by method of fluoride selective electrode.When the pH value of solution was from 5.0 to 7.0,adding citric acid-sodium citrate buffer solution to eliminate the interference of aluminum ion,ferric ion etc,it was quantified by Cartesian coordinate system and semi-logarithm coordinate system.The standard deviation was 3.3%,and recovery was 98.4~100.6%.