title: Evaluation of an ammonium ionophore for use in poly(vinyl chloride) membrane ion-selective electrodes: solvent mediator effects.
abstract: A macrotetrolide nonactin-based ammonium ionophore (AI) preparation containing 25% nonactin optimized for use in liquid membrane ion-selective electrodes was investigated for its possible use in poly(vinyl chloride) (PVC) matrix membrane-type electrodes. Nine different plasticizing solvent mediators were employed in the ammonium ion-selective membranes with PVC and the AI preparation. Near Nernstian responses were observed in aqueous solution with electrodes fabricated with dioctyl sebacate-, 2-nitrophenyl phenyl ether-, dibutyl sebacate-, trioctyl phosphate-, dioctyl adipate-, dioctyl phenyl phosphonate- and 2-nitrophenyl octyl ether-plasticized membranes. The responses of these electrodes were found to improve in the presence of a background concentration of non-interfering calcium ions.
authors.affiliation: School of Chemistry and Applied Chemistry, University of Wales, Cardiff, UK.
authors.forename: M S
authors.initials: MS
authors.lastname: Ghauri
authors.forename: J D
authors.initials: JD
authors.lastname: Thomas
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D005069:Evaluation Studies as Topic; D007476:Ionophores; D008567:Membranes, Artificial; D011143:Polyvinyl Chloride; D011199:Potentiometry; D000644:Quaternary Ammonium Compounds; D012997:Solvents
chemical_list: D007476:Ionophores; D008567:Membranes, Artificial; D000644:Quaternary Ammonium Compounds; D012997:Solvents; D011143:Polyvinyl Chloride