Spectrophotometric determination of iron through measurement of permittance of the copper-ethylene diamine tetraacetate absorbing system

Author(s): S.R.Labhade, V.B.Gaikwad

A new analytical method has been proposed for spectrophotometric determination of iron through measurement of permittance of the copper(II)- ethylenediaminetetraacetate, [Cu(II)-EDTA]-2 absorbing system. In this method, Fe3+ solution buffered at pH 1.15 was treated with measured and excess of ethylenediaminetetraacetic acid (EDTA) and the surplus EDTA was used for generation of [Cu(II)-EDTA]-2 system. Permittance of the absorbing system measured at 722nm was observed directly proportional to the concentration of iron.At pH 1.15, the average value of the permittance coefficient was investigated as 0.5168 lit.g-1cm-1 for quantitative determination of iron in the range of 1.0mg to 10.0mg. The effects of some important variables on the determination of iron based on proposed method were studied. Efficacy of thismethod was further tested for determination of iron in Livogen-Z, Ferium-xt and Orofer-xT tablets. The average accuracy was found good, which was evaluated by comparison of results obtained with those claimed by the manufacturer. The metal cations such as aluminum, barium, calcium, cadmium, lead, magnesium, manganese, zinc, and copper do not interfere in determination of iron.

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