title: Galvanic cell without liquid junction for potentiometric determination of copper.
abstract: This paper describes potentiometric measurements in an integrated galvanic cell with both indicator and reference electrodes. Both electrodes are conducting polymer-based. The copper-sensitive indicator electrode is made by using poly(3,4-ethylenedioxythiophene) (PEDOT) doped with 2-(o-arsenophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonic sodium salt (Arsenazo-I) as the electroactive substance in the film, while the reference electrode is based on PEDOT doped by 2-morpholineoethanesulfonic acid (MES). It is shown that the galvanic cell can be used for determination of copper both in non-aqueous media (where all PVC-based membranes failed) and in the presence of chloride ions, which disturb the signal of conventional copper ion-selective electrodes with solid-state membranes. It is further shown that the titration of copper ions can be successfully monitored using the described electrochemical cell.
authors.affiliation: Faculty of Material Science and Ceramics, AGH-University of Science and Technology, PL-30059 Krakow, Poland. migdal@uci.agh.edu.pl
authors.forename: Jan
authors.initials: J
authors.lastname: Migdalski
authors.forename: Teresa
authors.initials: T
authors.lastname: Błaz
authors.forename: Barbara
authors.initials: B
authors.lastname: Zrałka
authors.forename: Andrzej
authors.initials: A
authors.lastname: Lewenstam
mesh_terms: D001150:Arsenazo III / Q000737:chemistry*; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D003300:Copper / Q000032:analysis*; D004563:Electrochemistry; D017736:Ion-Selective Electrodes; D011108:Polymers / Q000737:chemistry*
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D011108:Polymers; C121383:poly(3,4-ethylene dioxythiophene); D001150:Arsenazo III; C035803:arsenazo I; D003300:Copper