Complexo-Titrimetric Determination of Palladium(II) Using 1,3,4,6-Tetrahydropyrimimdine-2-Thione as a Replacing Reagent

Abstract

A simple, rapid, convenient, accurate and selective complexotitrimetric method using the masking technique is proposed for the determination of palladium(II). In presence of diverse metal ions palladium(II) is complexed with a known excess of EDTA and the uncomplexed EDTA is back titrated with lead nitrate solution in acetic acid-sodium acetate buffer (pH 5.0–6.0) to the sharp end point of xylenol orange indicator. A 0.5% solution of 1, 3, 4, 6-tetrahydropyrimidine-2- thione (TPT) in acetone is added to displace EDTA quantitatively from the Pd-EDTA complex. The released EDTA is titrated against standard lead nitrate solution.