A new polyvinylchloride membrane sensitive to Cd+2 ions basede on 1,3-diphenyl-5-P-nitrophenylformazan as ionophore has been prepared. This electrode shows a Nernestian response for cadmuim ions over a wide range ( 1.0 ×10-6 to 1.
0 ×10-1 M ) with the slope of 27.74 mv . decade-1 . the detiction limite is 7 × 10-7 M . It has a fast response time of 15 s and can be used for at least 4 mounth without any divergence in potential . the electrode can be used in the pH range from 4.0 to 9.0 . the proposed electrode shows avery good discriminating ability towards Cd+2 ion in presence of some alkali , alkaline earth , transition and heavy metal ions. It was successfully applied for the direct determination of Cd+2 in standard and real sample solutions
Five derivatives of Formazn (FM1–FM5) were prepared through reaction between
benzaldehydphenylhydrazone with five diazonium salts by a reaction ratio of 1:1 in
alkaline medium. The hydrazone was prepared through the reaction between
phenylhydrazin
e and benzaldehydeby a reaction ratio of 1:1 in a slight acidic medium.
Crystals of formazans resulting from recrystalization were formed by using different
solvents and show variation of solubility among these formazans according to the kind of
the solvent and the kind of diazonium salt used. Their purity was studied by using thin
layer chromatography. The melting point of the prepared hydrazone and the resulting
Formazan complexes were complexes with lead (II), copper(II) and cadmium were
successfully prepared and studied by using UV and IR spectroscopy. These complexes
were used as ionophors and applied as electrically active materials in the preparation of
ion-selective membranes for the mentioned metal ions.
