Kinetic determination of Hg(II) based on its accelerating effect on the reaction between hexacyanoferrate(II) and 1,10-phenanthroline catalysed by micelles.
A kinetic-photometric method for the determination of Hg(II) over the range 10-80 ng/ml is proposed. It is based on the accelerating effect of this ion on the reaction between hexacyanoferrate(II) and 1,10-phenanthroline which is monitored via the ferroin complex formed. Anionic sodium dodecyl sulphate (SDS) micelles, which catalyse the reaction, allow the ferroin complex to be formed under more acidic conditions. Combination of this pH shift and the development of the reaction in the vicinity of micelles results in improved selectivity in the determination of Hg(II) compared to the reaction occurring in an aqueous medium. Some observations on the effect of SDS on the reaction are reported.
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Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Córdoba, Spain.
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Bendito
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