ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

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

E-mail: konlubmut@yahoo.com

Received: 15 December 2005  Revised: 17 February 2006  Accepted: 24 February 2006

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.

Keywords: manganese(II) - kinetic determination - azo dye oxidation - vegetables

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-006-0048-2

Chemical Papers 60 (4) 279–282 (2006)