The Electrochemical Behavior of UO22+ Incorporated in Thin Sol-Gel Film on the Glassy Carbon Electrode and the Determination of Cupferron

Abstract

A novel kind of electrode for determination of ammonium nitrophenylhydroxyamine (Cupferron) was developed via an easy and effective immobilization method using an acid-catalyzed sol-gel technique. The electrode comprised uranyl nitrate (UO2(NO3)2) immobilized by the thin silica sol-gel film on a glassy carbon electrode (GCE). The UO2(NO3)2 retained its good preconcentration characteristic when being doped by the sol-gel film. Cupferron was determined by the direct reduction at the silica sol-gel immobilized UO2(NO3)2 electrode. Moreover its electrochemical behavior was also investigated. The determination conditions for Cupferron were optimized. The UO22+ film electrode still retained high stability after three months. The experimental results show that this method for Cupferron determination possessed good reproducibility and applicability.