离子选择电极法测定净化湿法磷酸中氟含量的方法比较

分别采用标准曲线法和标准加入法测定净化湿法磷酸中氟含量,考察两种方法测定结果的差异。实验结果表明,标准曲线法的相关系数(R2)均在0.999 5以上;当加入氟标准溶液体积不小于0.5 m L,标准加入法可替代标准曲线法对湿法精制磷酸中氟含量进行测定。该方法简便、快速、可靠,可推广至生产应用中。

Comparison of methods for determination of fluorine content in purified WPA by ion selective electrode method

The fluorine content in purified wet process phosphoric acid is respectively determined by standard curve method and standard addition method, the differences of result of two methods are investigated. The results show that： the correlation coefficient （R2） of standard curve method is more than 0.999 5; when the volume of adding fluorine standard solution is not less than 0.5 mL, the standard addition method can replace the standard curve method for determination of fluorine content. The standard addition method is simple, fast, reliable, and can be popularized in the actual production application.