Preparation of a Liquid Membrance Type Ion-Selective Electrode and Its Application to the Potentiometric Titration

摘要

Construction of a liquid membrane type of cupric ion selective electrode and its application to the potentiometric titration have been studied. A liquid ion-exchange membrance was prepared by extracting Cu(￥±) in aqueous solution into 1-(2-pyridylazo)-2-naphtholitrobenzene. A Ag/AgCl internal reference electrode was dipped into the aqueous reference solution of 1.00 ?? 10-3M Cu(NO3)2 buffered with HAc-NaAc buffer solution, which was in contact with the nitrobenzene extract. The electrode showed the nernstian response to Cu(￥±) in the concentration range from 1.00 ?? 10-6 to 1.00 ?? 10-3M. The most suitable ion-exchanger concentration in the liquid membrane was 1.00 ?? 10-4M. The selectivity coefficients of the electrode for the various metal cations were investigated. The electrode was applied to the potentiometric titration of Cu(￥±) with EDTA.