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Abstract
Vanadium (V) reacts with the 2-pyridinealdehyde-2-quinolylhydrazone in hydroalcoholic mixtures at pH values between 3 and 5 (pD = 6'3), glving a complex which stoichlometry from spectrophotometric data has been established as 2: 1 (reagent: cation). This red coloured complex is stable 2 hours at least and its maximal absorption is shown between the
pH values 4 and 5"2. The opti- caI den sities of the solutlons of that complex obey the Lambert-Beer law in the range of concentrations between 0'5 and 6 ppm of vanadium. The molar absoptivity coefficient is (10'0 ± 0'3) . 103 and the unstability constant pK = 8'00 ± 0'04.
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