Determination of manganese in some medicinal plants and their infusions by a kinetic spectrophotometric method

Author: Mutaftchiev, Konstantin Lubenov

Source: Chemical Speciation and Bioavailability, Volume 13, Number 2, May 2001 , pp. 57-60(4)

Publisher: Science Reviews 2000 Ltd

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Abstract:

The catalytic effect of manganese (II) on the oxidation of the azo dye Acid Black 1 with potassium periodate in the presence of 1,10-phenanthroline in weakly acidic media is investigated. The reaction is followed spectrophotometrically by measuring the decrease in the absorbance of the azo dye at 618 nm. Under the optimum conditions (3×10⁻⁵ mol/L azo dye, 6×10⁻⁴ mol/L potassium periodate, 1×10⁻⁴ mol/L 1,10-phenanthroline, 0.1 mol/L buffer-pH 4.0, 60°C, 5 min) manganese (II) in the range 0.08-4 ng/mL can be determined by the fixed-time method with the detection limit of 0.025 ng/mL. The method developed is highly sensitive, selective and simple. It has been applied successfully to analyse infusions of some medicinal plants (dandelion, common marigold, cowslip and common yarrow) for trace amounts of free manganese (II) without separation and total manganese. Total manganese was also determined in these plants.

Keywords: manganese determination; kinetic spectrophotometric method; medicinal plants; infusions

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422901783726807

Affiliations: 1: Department of Chemistry and Biochemistry, Higher Medical Institute, 1 Kliment Ohridski Street, Pleven 5800, Bulgaria

Publication date: 2001-05-10

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Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.
Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.
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Determination of manganese in some medicinal plants and their infusions by a kinetic spectrophotometric method

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