Spectrophotometric determination of vanaditun(V) with salicylaldehyde thiosemicarbazone

Abstract

Salicylaldehyde thiosenticarbazone forms a yellow-coloured species with vandium(V) at pH 5 -  0-6- 5.  A 5-fold excess of the reagent is necessary for full development of colour intensity. Beer's law is obeyed  over the concentration range of 0 . 5-4 . 0 ppm. of vanadium(V). The molar absorptivity and Sandell  photometric sensitivity at 370 nm are 6 .30 x 10^3  lit. mole^-1 . cm^-1 and 8. 09 ng. em^-2  respectively. The  composition of the complex established by Job's method is 1: 1 (metal : ligand). The colour of the  complex is found to be stable for over three days. The method is simple, selective, sensitive and needs no extraction or heating.