微量滴定法测定铁矿中的全铁含量

Determination of Iron in Iron Ore by Micro-titrimetry

介绍一种用于铁矿中铁含量测定的微量滴定方法.该法采用WD-COⅡ型微量滴定管(中国专利ZL00230756.1),以K2Cr2O7为滴定剂,采用甲基橙指示剂代替有毒试剂HgCl2,指示预处理完全程度和除去过量的还原剂Sn2+,该法使分析速度加快,试剂耗量减少,且与常量滴定法结果一致.

The micro-titration,it was applied to determine the iron content of iron ore. the iron ore was dissolved in HCl, then was treated with Sn^(2+). Methyl orange was used as indicatior in the prereduction of Fe(Ⅲ) and to eliminated the extra proeductant Sn^(2+).The resulting Fe(Ⅱ)was titrated with K_2Cr_2O_7 solution and dipherylamine sulfonic sodium as imdicator.The titration results were well in accordance with that obtained by normal titrimetry.However, This method showed some advantage over the normal one.