Kinetic, spectrophotometric determination of nanogram levels of manganese(II) using catalytic azo dye—potassium periodate—1,10-phenanthroline system
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K. Mutaftchiev
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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© 2006 Institute of Chemistry, Slovak Academy of Sciences
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Articles in the same Issue
- Influence of medium on the kinetics of oxidation of iron(II) ion with t-butyl hydroperoxide
- Synthesis of new thiazolo[2,3-b]pyrimidine derivatives of pharmaceutical interest
- Enthalpic analysis of the CaTiSiO5 system
- Kinetic, spectrophotometric determination of nanogram levels of manganese(II) using catalytic azo dye—potassium periodate—1,10-phenanthroline system
- Application of a ternary complex of tungsten(VI) with 4-nitrocatechol and thiazolyl blue for extraction-spectrophotometric determination of tungsten
- Determination of risperidone at picogram level in human urine by luminol—H2O2 chemiluminescence
- Electrochemical dissolution of chalcopyrite studied by voltammetry of immobilized microparticles
- Colon tissue concentrations of copper, iron, selenium, and zinc in colorectal carcinoma patients
- Structure of tetrakis(pyridinioacetate) neodymium(III) tetrahydrate perchlorate
- Thermally stable oligomer—Metal complexes based on oligo-ortho-aminophenol and oligophenylazomethinephenol
- Adsorption of SO2 on alumina
- One-pot, three-component synthesis of secondary amines and trisubstituted hydrazines from ketones
- Synthesis of α,α′-bis(R-benzylidene)cycloalkanones catalyzed by potassium hydrogen sulfate under solvent-free conditions
- Electrical conductivity of the molten KF—K2TaF7 system
- New substituted mono-and bis(imidazolyl)pyridines and their application in nitroaldolisation reaction
