We have developed an experimental procedure to perform analysis of chromium and iron simultaneously in chromite ore. Chromium and iron were extracted from fused ore by one molar sulphuric acid. The reduction of Cr(VI) to Cr(III) and Fe(III) to Fe(II) was carried out by sodium sulphate. Iron was estimated as [Fe (phen)3]2+ (phen = o-phenanthroline) and chromium as Cr(III) ions in solution. In several determinations of synthetic mixture the accuracy of the result for chromium and iron was found to be within 2.0%.
M FAZAL ULLAH ,Z U SIDDIQUI ,
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