返滴定法测定含铟溶液中铟含量

Determination of Indium Content In Solution Containing Indium by Back Complexometric Titration

提出了一种从复杂含铟溶液中，用返滴定法测定铟含量的新方法。通过氢溴酸挥发除去锑、锡离子后，在稀Ｈ２ＳＯ４溶液中，用Ｐ２０４－煤油溶液萃取，利用稀ＨＣ１反萃，可以使铟与干扰元素分离，用定量过量ＥＤＴＡ络合后，用标准锌溶液返滴定，可以测定铟含量。

The paper has introduced a new method determining In in complex Solutionconstaining In by back complexometric titration. By evaporating with HBr,Sb3+ .Sn4+can beremoved, then extracting with P204-kerosine in dilute solution of sulfuric acid and counter-extrating with dilute solution of hydrochloric acid, Indium can be separated from interfering ions. After adding EDTA of definite quantity in counter solution,the residual EDTA canbe titrated by standard solution of zinc ion. Thus,the indium can also be determinded.