Novel gadolinium PVC-based membrane sensor based on omeprazole as an antibiotic

摘要

A novel gadolinium ion-selective electrode based on the antibiotic omeprazole as membrane carrier was prepared. The electrode has a linear dynamic range between 1.0 x 10(-1) and 1.0 x 10(-5) M, with a Nernstian slope of 19.3 +/- 0.3 mV decade(-1) and a detection limit of 5.0 x 10(-6) M. The potentiometric response is independent of the pH of the solution in the pH range 4.0 - 10.0. The electrode possesses the advantages of short conditioning time, fast response time and especially, very good selectivity over a large number of other cations. The electrode can be used for at least 2 months without any considerable divergence in potentials. It was used as an indicator electrode in potentiometric titration of Gd(III) ions with EDTA. [References: 25]