容量法测定水样中硫酸根

Volumetric Determination of Sulfata in Water

摘要: 本文对EDTA滴定过量Pb间接测定SO_4~(2-)的方法作了改进。加入乙醇抑制PbSO_4沉淀的溶解,使滴定不需分离沉淀而直接进行。用六次甲基四胺调节控制pH为5.2—5.4,可避免大量共存Ca~(2+)、Mg~(2+)的干扰。改进后的方法简单、快速,准确度和精密度均好,可适用SO_4~(2-)含量高于1mg/L的天然水分析。

Abstract: A modification of the complexometric titration for the determination of SO42- in water was suggested. 20 ml of absolute alcohol was added to 50 ml of water sample to prevent the dissolution of lead sulfate and the separation of the precipitate was obviate