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Manganese (II)-1,10-phenanthroline-azo dye-potassium periodate system for kinetic spectrophotometric determination of nanogram levels of manganese

Mutaftchiev K. L.

Bulletin of the Polish Academy of Sciences. Chemistry

2001

Vol. 49, No. 3

193-201

The catalytic effect of manganese (II) on the oxidation of l,3-dimethyl-2 [4-N (N,N-dimethylamino) phenylazo] imidazolium perchlorate, with potassium periodate in the presence of 1,10-phenanthroline in weakly acidic media is studied. The reaction is followed spectrophotometrically by measuring the decrease in the absorbance of the dye at 540 nm. A kinetic method for determination of manganese (II) is developed. Manganese (II) in the range 0.1-4.5 ng cm(-3) can be determined by the fixed-time method. The detection limit is 0.03 ng cm(-3), and the RSD is 1.0% for 2 ng cm(-3). The method is extremely sensitive, highly selective, and simple. It was applied to the determination of manganese in walnuts, monkey-nuts, and hazel-nuts. This is the first attempt to apply a kinetic method to determine manganese in these nuts. The results showed good agreement with those obtained by atomic absorption spectrophotometry.