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Kinetic, spectrophotometric determination of nanogram levels of manganese(II) using catalytic azo dye—potassium periodate—1,10-phenanthroline system

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Abstract

The catalytic effect of manganese(II) on the oxidation of the dye, sodium salt of 4-(2-hydroxynaphth-1-ylazo)benzenesulfonic acid, with potassium periodate in the presence of 1,10-phenanthroline in weakly acidic media was studied. The reaction was followed spectrophotometrically by measuring the decrease in the absorbance of the dye at λ = 483 nm. Under the optimum conditions Mn(II) concentration within the range of 0.08–4 ng cm−3 could be determined by the fixed-time method with a detection limit of 0.025 ng cm−3. The method was applied for the determination of manganese content in tomatoes, aubergine, white radish, and French beans. The results showed a good agreement with those obtained by atomic absorption spectrophotometry.

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  1. Laboratory of Trace Elements Determination, Medical University, Pleven, 5800, Bulgaria

    K. L. Mutaftchiev

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  1. K. L. Mutaftchiev
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Mutaftchiev, K.L. Kinetic, spectrophotometric determination of nanogram levels of manganese(II) using catalytic azo dye—potassium periodate—1,10-phenanthroline system. Chem. Pap. 60, 279–282 (2006). https://doi.org/10.2478/s11696-006-0048-2

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  • DOI: https://doi.org/10.2478/s11696-006-0048-2

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