碱式硫酸铝溶液中SO42-的测定

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SO₄^2-的测定方法。实验确定的操作条件为：待测试样稀释后ρ（SO_4^2-）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。

Detection of SO42- in Basic Aluminum Sulfate Solution

The method for detection of SO₄^2- 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：ρ(SO₄^2-) 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.