Highly selective copper membrane electrode using C-p-nitrophenyl-N-phenylnitrone
Abstract
The construction, performance characteristics and applications of a polymeric membrane electrode for Cu(II) ion are reported. The electrode was prepared by incorporating C-p-nitrophenyl-N-phenylnitrone as the charge carrier into a plasticized poly(vinyl chloride) membrane. The influence of membrane composition, pH and concentration of the solution were investigated. The electrode exhibits a potentiometric response for Cu2+ ion over the concentration range 1 × 10−6–1 × 10−1 M with a detection limit of 5 × 10−7 M Cu2+. It shows a relatively fast response time of about 15 s and can be used for about two months without any considerable divergence in potential. The electrode can be used at a pH of between 4.0–8.0. The selectivity of proposed electrode for Cu2+ in the presence of several metal ions. It was used as an indicator electrode in the potentiometric titration of Cu2+ with EDTA.