二氧化硫标准溶液的直接标定法

提出了一种标定SO₂标准溶液浓度的新方法—用Na₂SO₃标准溶液直接滴定由KIO₃与过量KI反应所生成的I₂。该方法与标准法相比,省略了稳定性较差的Na₂S₂O₃溶液的配制和标定操作,不用易挥发损失的I₂溶液,缩短了分析时间,降低了分析成本。它的反应条件较宽松,精密度高,CV≈0.082%,标定结果与标准法无显著性差异,RE<±0.4%,是一种值得提倡的方法。

DIRECT STANDARDIZATION METHOD FOR SULFUR DIOXIDE STANDARD SOLUTION

A new method of standardizing sulfur dioxide standard solution has been presented, in which iodine that is derived from the reaction of KIO₃with excess KI istitrated directly.Comparing with standard methods, the new way does not need to prepare and standardize the unstable Na₂S₂O₃solution and usevolatile I₂. As a result, the analytical time is shortened and the cost is reduced. The reaction condition is easy to reach and the method has high accuracy (CV≈0.082%, RE<±0.4%).It is a method that is worth recommending.