Spectroscopic in Situ Imaging of Acid Coextraction Processes in Solvent Polymeric Ion-Selective Electrode and Optode Membranes

Ernö Lindner, Titus Zwickl, Eric Bakker, Bui Thi Thu Lan, Klara Tóth, Ernö Pretsch

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Time-dependent processes induced by acidic solutions in solvent polymeric membranes with a H+-selective chromoionophore are studied in a spectropotentiometric setup. They are important for understanding the response time of anion-selective optodes and the response of H+-selective electrodes at low pH when anion interference is potential determining. The extent of anion - proton coextraction is characterized with extraction experiments on thin optical films (optodes) containing the same components and described by theory. Imaging experiments indicate rapid diffusion processes and unusual nonlinear steady-state concentration profiles that are explained by parallel extraction of undissociated acid into the membrane. Long-term potential drifts of the respective electrode are detected and related to the diffusion processes.

Original languageEnglish
Pages (from-to)1176-1181
Number of pages6
JournalAnalytical Chemistry
Volume70
Issue number6
DOIs
Publication statusPublished - Mar 15 1998

ASJC Scopus subject areas

  • Analytical Chemistry

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