Some new aromatic hydroxylamines as spectrophotometric reagents for vanadium |
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Authors: | AK Majumdar Gayatri Das |
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Institution: | Department of Inorganic and Analytical Chemistry, Jadavpur University, Calcutta 32 India |
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Abstract: | A comparative study is described of the use of N-benzoyi-o-tolyl-, N-benzoyl-m-tolyl, N-benzoyl-p-tolyl-, N-benzoyl-p-chlorophenyl- and N-phenylacetylphenyl-hydroxylamines, as spectrophotometric reagents for the determination of vanadium, after extraction with chloroform. All the reagents form 1:2 (metal:reagent) complexes in hydrochloric acid media or at pH 4.8–6.0; the dissociation constants of the complexes are of the order of 10-9 and 10-8, respectively, except those of N-benzoyl-p-chloro-phenylhydroxylamine which are of the order of 10-8 in both media. The reactions in hydrochloric acid media are more selective and sensitive than those at pH 4.8–6.0. In presence of alcohol, the wavelengths of maximum absorption decrease. The pKa values of the hydroxylamines were determined in water and in alcohol-water (1:1) solutions. |
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