Application of a New Macrociclic-PVC Electrode to Potentiometric Studies of Cr(III) Ion and Its Computational studies

A new macrocyclic ligand as a neutral carrier in the construction of a new PVC membrane electrodeselective to Cr(III) ion was prepared. The electrode exhibits a good potentiometric response for Cr(III) over a wideconcentration range 1.0 × 10-4 to 1.0 × 10-1 M with a slope 20.4±0.5 mV/decade and low detection limit of 8.9 × 10-5M. It has a fast response time ≤ 20s. The best performance was observed with the membrance having the PVC- ligandacetophenone-oleic acid composition 6:1:7:1. The electrode assembly was also used as indicator electrode in thepotentiometric titration of Cr(III) with EDTA. The structure of the ligand was also studied by HF calculations using astandard 6-31G* basis set and LanL2DZ.

Keywords:

PVC membrane , Cr(III) , sensor , potentiometry , New Macrociclic , HF , LanL2DZ