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Determination of Manganese in Some Medicinal Plants and their Water Extracts by a Kinetic Spectrophotometric Method
Mutaftchiev, K. L. Determination of Manganese in Some Medicinal Plants and their Water Extracts by a Kinetic Spectrophotometric Method Chemical Papers, Vol.56, No. 3, 2002, 194-198
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Attached Files |
| Name |
Description |
MIMEType |
Size |
Downloads |
n563a194.pdf
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563a194.pdf |
application/pdf |
133.74KB |
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| Author(s) |
Mutaftchiev, K. L.
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| Title |
Determination of Manganese in Some Medicinal Plants and their Water Extracts by a Kinetic Spectrophotometric Method
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| Journal name |
Chemical Papers
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| Publication date |
2002
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| Year available |
2002
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| Volume number |
56
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| Issue number |
3
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| ISSN |
0366-6352
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| Start page |
194
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| End page |
198
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2002
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| Language |
english
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| Subject |
270000 Biological Sciences
270100 Biochemistry and Cell Biology
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| Abstract/Summary |
The catalytic effect of manganese(II) on the oxidation of the dye 3-methyl-6-(2-chloroethoxy)-2- [2-methoxy-4-(N,N-diethylamino)phenylazo]benzothiazolium methyl sulfate 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 dye at λ = 550 nm. Under the optimum conditions (ci: 4 × 10−5 mol dm−3 (dye), 6 × 10−4 mol dm−3 (potassium periodate), 1 × 10−4 mol dm−3 (1,10-phenanthroline), 0.1 mol dm−3 (buffer – pH 3.0), 70ºC, 8 min) ρ(Mn(II)) in the range 0.1—5 ng cm−3 can be determined by the fixed-time method with the detection limit of 0.03 ng cm−3. The developed method is highly sensitive, selective, and simple. The method was applied successfully to analyze decoctions (fruits of one-styled hawthorn and dog-rose) and infusions (blossom of German chamomile and leaves of spearmint) for trace amounts of free manganese(II) without separation and total manganese. Total manganese was also determined in these plants.
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