Catalytic Spectrophotometric Determination of Manganese in Some Medicinal Plants and Their Infusions

Authors : Konstantin L MUTAFTCHIEV

Pages : 619-626

View : 16 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The catalytic effect of manganese insert ignore into journalissuearticles values(II); on the oxidation of the dye 1,3-Dimethyl- 2 [4-N insert ignore into journalissuearticles values(N,N-dimethylamino); phenylazo] imidazolium perchlorate insert ignore into journalissuearticles values(BR); with potassium periodate in the presence of 1,10-phenanthroline was investigated. The reaction was followed spectrophotometrically by measuring the decrease in the absorbance of the dye at 540 nm. Under optimum conditions insert ignore into journalissuearticles values(5 \times 10-5 mol dm-3 BR, 2 \times 10-4 mol dm-3 potassium periodate, 1 \times 10-4 mol dm-3 1,10-phenanthroline, 0.1 mol dm-3 buffer -- pH 3.0, 70 °C, 5 min); manganese insert ignore into journalissuearticles values(II); in the range 0.1--4.5 ng cm-3 can be determined by the fixed-time method with a detection limit of 0.03 ng cm-3. The developed method is highly sensitive, selective, and simple. The method was applied successfully to analyse infusions of some medicinal plants insert ignore into journalissuearticles values(common balm, creeping thyme, common lungwort, and colt`s-foot); for trace amounts of total manganese and free manganese insert ignore into journalissuearticles values(II); ions without separation. The results showed good agreement with those obtained by atomic absorption spectrophotometry.
Keywords : manganese determination, catalytic spectrophotometric method, medicinal plants, infusions