Determination of vanadium(V) with 3-(2-hydroxy-5-methylphenyl)-5-(p-methoxyphenyl)isoxazoline (HMPAO)

The extraction studies of vanadium(V) with 3-(2-hydroxy-5-methylphenyl)-5-(p-methoxyphenyl) isoxazoline (HMPAO) have been done. Vanadium is extracted into chloroform as a yellow-colored complex with HMPAO from 8.0 M HCl medium. The complex absorbs maximum at 400 nm. The system conforms to Beer's law over the concentration range 1.1–39 μg of vanadium per milliliter. The color of the complex was stable for 60 hr. Vanadium was extracted quantitatively and was determined in the presence of large number of foreign ions associated with it. The extractable species was 1:2 (V:HMPAO) in nature. The stability constants of the complex were determined by Yatsimirskii's and Leden's methods.