钛白粉及金红石中TiO2的置换配位滴定

本文提出了测定钛白粉和金红石中二氧化钛的简易置换配位滴定法，向含有钛离子和其它阳离子的溶液中加入过量的环己烷二胺四乙酸（ＤＣＴＡ），以二甲酚橙（ＸＯ）为指示剂，用乙酸锌标准溶液返滴定过量的ＤＣＴＡ，然后以氟化物分解Ｔｉ（ＩＶ）－ＤＣＴＡ配合物，释放出的ＤＣＴＡ，用乙酸锌标准溶液滴定，本法终点变化敏锐，具有很好的精密度和准确度。

Selective Chetatometry of Titanium Dioxide in Titanium White And Rutile

In the paper, a simple and fast selective chelatometry of titanium dioxide in titania and rutile is presented. Execess DCTA is added to a solution containing Titanium and other cations and at pH 5. 5 the surplus is back-titrated by Zn(Ac)2 standard solution with Xylenol orange as the indicator. Fluoried is then added to decompose the Ti(IV)-DCTA chelates and the liberated DCTA is titrated with Zn(Ac)2 standard solution. The change of endpoint is more sensitive. The proposed method has been applied to the determination of titatmium in Titania and rutile with satisfactory results.