Spectrophotometric Determination of Vanadium(V) after Separation by Adsorption of its N-p-Bromophenylthiobenzohydroxamic Acid Complex on Microcrystalline Naphthalene

Abstract

The method of adsorption of N-p-bromophenylthiobenzohydroxamic acid vanadium(V) complex on microcrystalline naphthalene followed by a solid-liquid separation is described for the trace analysis of vanadium. This complex is stable in naphthalene dimethyl formamide solution. The absorbance has showed a linear relationship to the concentration of vanadium in the range 7-150 μg per 10 mL of dimethyl formamide. The molar absorptivity and sensitivity have been found to be 2.6 × 10⁴ L mol^-1 cm^-1 and 0.01346 μg cm^-2, respectively for the absorbance of 0.001 with a standard deviation of 0.17 %.