碱式硫酸铝溶液中SO42-的测定

摘要

The method for detection of SO42-in basic aluminum sulfate solution was established by EDTA back-titration of excess BaCl2 and using eriochrome black T as indicator.The operation conditions determined by experiments are as follows:p(SO42-) of the diluted sample 0.025-0.100 g/L,BaCl2 excessive ratio 25％-100％,adding BaCl2 into boiling sample,triethanolamine dosage 0.10 L/L.This detection method is accurate,reliable,simple and rapid with 98.90％-100.72％ of recovery rate and less than 1％ of relative standard deviation.%建立了以铬黑T为指示剂,乙二胺四乙酸二钠反滴定过量BaCl2的碱式硫酸铝溶液中SO42-的测定方法.实验确定的操作条件为:待测试样稀释后p(SO42-)为0.025 ～0.100 g/L,BaCl2过量率为25％～100％,并且在加入BaCl2前将试样煮沸,三乙醇胺加入量为0.10 L/L.该法回收率在98.90％～100.72％,相对标准偏差小于1％.测定方法准确,可靠,且操作简便、快速.