Fe~(3+)、Fe~(2+)的连续测定

Continuous determination of iron(Ⅲ) and iron(Ⅱ)

摘要: 在强酸性溶液中，Ｆｅ３＋和Ｆｅ２＋共存，以磺基水杨酸作指示剂，用ＥＤＴＡ滴定Ｆｅ３＋，终点由紫红色突变至亮黄色。然后加入Ｈ２Ｏ２氧化Ｆｅ２＋，继续用ＥＤＴＡ滴定至终点由黄绿色至亮黄色，实现了Ｆｅ３＋、Ｆｅ２＋的连续测定。

Abstract: In the strong acid solution,Fe 2+ co-existing with Fe 3+ ,sulfosalicylic acid as indictor,the Fe 3+ was titrated by sodium ethylenediamine tetracetate, meanwhile the colour of ending point in titration varies from purgle red to bright yellow.After adding hydrogen peroxide,Fe 2+ was oxidized to Fe 3+ and titrated by sodium ethylenediamine tetracetate continuously.