EDTA返滴定钡法测定硫酸根

Determinaton of Sulfate Radical with Method of Reverse Titration Barium by EDTA

本文研究了在１．２５×１０￣（－３）～２．５×１０￣（－２）ｍｏｌ／Ｌ硫酸的稀水溶液中用ＥＤＴＡ返滴定钡测定硫酸根的条件。结果表明：钡可过量０．２～２．２倍，不分离沉淀，无需乙醇等降低沉淀的溶解度，指示剂终点变色较敏锐，测定硫酸根的相对误差小于１．０％。

This paper studies the quantitative analysis of SO(-2)4 in thin H2SO4 from 1. 25 ×10-3 M to 2.5×10-2 with the method of reverse titration Barium by EDTA. The result obtained showes that BaCl2 could be exceeded by a factor of 0. 2 to 2. 2,precipitation of BaSO4 needn't be removed and alcohol needn't be added to decrease the solubility of BaSO4, indicator colour change is rather sharply in the equivalence point, relative error is less than 1. 0%.