The determination of trace iron(II) is' usually interfered by the presence of iron(Ill) when ortho-phenanthroline colorimetric method is used. In this report a chromogenic reagent which contain'S onho-pbenantnroline-Blj'I'A mixture has been developed to decrease the interference of ferric ion after adjusting the acidity of sample at 0.1 N by adding the sulfuric acid. .The procedure -is also simplified by introducing sulfamate buffer solution (pH == I.S) without adjusting the acidity of sample with 'Sulfuric acid. If iron(I1l) is not present in the sample. this method is also applicable. The comparative results are exhibited for the present method and the conventional o-phenanthroline method.
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