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, K. Tóth, Ernö Pretsch

Research output: Contribution to journalArticle

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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
Publication statusPublished - Mar 15 1998

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Anions
Membranes
Imaging techniques
Acids
Optical films
Polymeric membranes
Electrodes
Protons
Experiments
Thin films
Ion-Selective Electrodes

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Spectroscopic in Situ Imaging of Acid Coextraction Processes in Solvent Polymeric Ion-Selective Electrode and Optode Membranes. / Lindner, Ernö; Zwickl, Titus; Bakker, Eric; Lan, Bui Thi Thu; Tóth, K.; Pretsch, Ernö.

In: Analytical Chemistry, Vol. 70, No. 6, 15.03.1998, p. 1176-1181.

Research output: Contribution to journalArticle

Lindner, Ernö ; Zwickl, Titus ; Bakker, Eric ; Lan, Bui Thi Thu ; Tóth, K. ; Pretsch, Ernö. / Spectroscopic in Situ Imaging of Acid Coextraction Processes in Solvent Polymeric Ion-Selective Electrode and Optode Membranes. In: Analytical Chemistry. 1998 ; Vol. 70, No. 6. pp. 1176-1181.
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