UO22+ ion-selective membrane electrode based on a naphthol-derivative Schiff's base 2,2′-[1,2-ethandiyl bis(nitriloethylidene)]bis(1-naphthalene)

Abstract

A new PVC membrane electrode for UO22+ ion based on 2,2′-[1,2-ethanediyl bis (nitriloethylidene)]bis(1-naphthalene) as a suitable ionophore was prepared. The electrode exhibites a Nernstian response for UO22+ ion over a wide concentration range (1.0 × 10-1-1.0 × 10-7 M) with a slope of 28.5 ± 0.8 mV/decade. The limit of detection is 7.0 × 10-8 M. The electrode has a response time of <20 s and a useful working pH range of 3-4. The proposed membrane sensor shows good discriminating abilities towards UO 22+ ion with regard to several alkali, alkaline earth transition and heavy metal ions. It was successfully used to the recovery of uranyl ion from, tap water and, as an indicator electrode, in potentiometric titration of UO22+ ion with Piroxycam.