N-p-chlorophenylcinnamohydroxamic acid: A new reagent for the microgram determination of vanadium(V)

Abstract

A new reagent, N-p-chlorophenylcinnamohydroxamic acid, for the rapid solvent extraction and spectrophotometric determination of microgram quantities of vanadium(V) is reported. Vanadium(V) is extracted from a chloroform solution of the reagent, N-p-chloro-phenylcinnamohydroxamic acid, with 4–8 M HCl. The bluish violet extract has maximum absorbance at 545 nm. The extract obeys Beer's law at 545 nm, and the sensitivity of the reagent is 0.008 μg V/ml. The complex is stable for several days. The effects of acidity, reagent concentrations, and diverse ions are discussed.