三塩化チタン還元, 有機指示薬判定法による鉄鉱石中の全鉄定量方法(<特集>鉄鋼分析)

概要

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In order to prevent the poliution of the drain-age from a chemical labolatory by Hg, the authors proposed two new methods for the determination of total iron in iron ores in place of JIS method in which Fe(III) is reduced with SnCl_2 and the excess of reductant is oxidized HgCl_2. Those method are as follows : For the purpose of verification analysis we established TiCl_3 reduction-ITS indicator method in which the most part of Fe(III) is reduced with SnCl_2, the remaining reduced with TiCl_3 and the excess of TiCl_3 is oxidized with K_2Cr_2O_7 using indigo tetrasulfonic acid as the indicator. Dissolution of sample and titration of Fe(II) are the same as JIS method. Cu(<2mg) and V(<3mg) do not interfere. Analytical results of iron ores by this method agreed closely with those by JIS method. (d_<max>=0.04%Fe) For the purpose of rapid analysis was established TiCl_3 reduction-NR indicator method in which main reagents used are H_3PB_4+H_2SO_4, metallic Al and neutral red indicator in place of HCl, SnCl_2 and ITS indicator in the former method, respectively. Sn and V(>1.2mg) interfere. Analytical results of iron ores without interfering elements by the later are similar to the former.
社団法人日本鉄鋼協会の論文
1974-11-01