Interpretation of chronopotentiometric transients of ion-selective membranes with two transition times

Justin M. Zook, Sándor Bodor, R. Gyurcsányi, Erno Lindner

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Passing currents through ion-selective membranes has contributed to the development of a variety of novel methods. In this work, chronopotentiometric (CP) transients with two transition times (breakpoints) are presented for the first time, with the theoretical interpretation of such voltage transients. The validity of our theory has been confirmed in experiments utilizing ETH 5294 chromoionophore-based pH sensitive membranes with and without lipophilic background electrolyte and ETH 5234 ionophore-based calcium-selective membranes in which the ionophore forms 3:1 complexes with Ca2+ ions. The conditions under which two breakpoints can be identified in the chronopotentiometric voltage transients are discussed. Spectroelectrochemical microscopy (SpECM) is used to show that the two breakpoints in the CP curves emerge approximately when the free ionophore and ion-ionophore complex concentrations approach zero at the opposite membrane-solution interfaces. The two breakpoint times can be utilized to follow simultaneously the concentration changes of the free ionophore, the ion-ionophore complex, and the mobile anionic sites in cation-selective membranes. In membranes with known composition, the time instances where breakpoints occur can be used to estimate the free ionophore and the ion-ionophore complex diffusion coefficients.

Original languageEnglish
Pages (from-to)254-261
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume638
Issue number2
DOIs
Publication statusPublished - Jan 15 2010

Fingerprint

Ion selective membranes
Ionophores
Membranes
Ions
Electric potential
Electrolytes
Cations
Calcium
Microscopic examination
Positive ions

Keywords

  • Determination of diffusion coefficients
  • Ion-selective electrodes
  • Membrane chronopotentiometry
  • Spectroelectrochemical microscopy
  • Theoretical treatment

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Interpretation of chronopotentiometric transients of ion-selective membranes with two transition times. / Zook, Justin M.; Bodor, Sándor; Gyurcsányi, R.; Lindner, Erno.

In: Journal of Electroanalytical Chemistry, Vol. 638, No. 2, 15.01.2010, p. 254-261.

Research output: Contribution to journalArticle

@article{7702a2ea2555444fa3e99d472c4a22e5,
title = "Interpretation of chronopotentiometric transients of ion-selective membranes with two transition times",
abstract = "Passing currents through ion-selective membranes has contributed to the development of a variety of novel methods. In this work, chronopotentiometric (CP) transients with two transition times (breakpoints) are presented for the first time, with the theoretical interpretation of such voltage transients. The validity of our theory has been confirmed in experiments utilizing ETH 5294 chromoionophore-based pH sensitive membranes with and without lipophilic background electrolyte and ETH 5234 ionophore-based calcium-selective membranes in which the ionophore forms 3:1 complexes with Ca2+ ions. The conditions under which two breakpoints can be identified in the chronopotentiometric voltage transients are discussed. Spectroelectrochemical microscopy (SpECM) is used to show that the two breakpoints in the CP curves emerge approximately when the free ionophore and ion-ionophore complex concentrations approach zero at the opposite membrane-solution interfaces. The two breakpoint times can be utilized to follow simultaneously the concentration changes of the free ionophore, the ion-ionophore complex, and the mobile anionic sites in cation-selective membranes. In membranes with known composition, the time instances where breakpoints occur can be used to estimate the free ionophore and the ion-ionophore complex diffusion coefficients.",
keywords = "Determination of diffusion coefficients, Ion-selective electrodes, Membrane chronopotentiometry, Spectroelectrochemical microscopy, Theoretical treatment",
author = "Zook, {Justin M.} and S{\'a}ndor Bodor and R. Gyurcs{\'a}nyi and Erno Lindner",
year = "2010",
month = "1",
day = "15",
doi = "10.1016/j.jelechem.2009.11.007",
language = "English",
volume = "638",
pages = "254--261",
journal = "Journal of Electroanalytical Chemistry",
issn = "0022-0728",
publisher = "Elsevier Sequoia",
number = "2",

}

TY - JOUR

T1 - Interpretation of chronopotentiometric transients of ion-selective membranes with two transition times

AU - Zook, Justin M.

AU - Bodor, Sándor

AU - Gyurcsányi, R.

AU - Lindner, Erno

PY - 2010/1/15

Y1 - 2010/1/15

N2 - Passing currents through ion-selective membranes has contributed to the development of a variety of novel methods. In this work, chronopotentiometric (CP) transients with two transition times (breakpoints) are presented for the first time, with the theoretical interpretation of such voltage transients. The validity of our theory has been confirmed in experiments utilizing ETH 5294 chromoionophore-based pH sensitive membranes with and without lipophilic background electrolyte and ETH 5234 ionophore-based calcium-selective membranes in which the ionophore forms 3:1 complexes with Ca2+ ions. The conditions under which two breakpoints can be identified in the chronopotentiometric voltage transients are discussed. Spectroelectrochemical microscopy (SpECM) is used to show that the two breakpoints in the CP curves emerge approximately when the free ionophore and ion-ionophore complex concentrations approach zero at the opposite membrane-solution interfaces. The two breakpoint times can be utilized to follow simultaneously the concentration changes of the free ionophore, the ion-ionophore complex, and the mobile anionic sites in cation-selective membranes. In membranes with known composition, the time instances where breakpoints occur can be used to estimate the free ionophore and the ion-ionophore complex diffusion coefficients.

AB - Passing currents through ion-selective membranes has contributed to the development of a variety of novel methods. In this work, chronopotentiometric (CP) transients with two transition times (breakpoints) are presented for the first time, with the theoretical interpretation of such voltage transients. The validity of our theory has been confirmed in experiments utilizing ETH 5294 chromoionophore-based pH sensitive membranes with and without lipophilic background electrolyte and ETH 5234 ionophore-based calcium-selective membranes in which the ionophore forms 3:1 complexes with Ca2+ ions. The conditions under which two breakpoints can be identified in the chronopotentiometric voltage transients are discussed. Spectroelectrochemical microscopy (SpECM) is used to show that the two breakpoints in the CP curves emerge approximately when the free ionophore and ion-ionophore complex concentrations approach zero at the opposite membrane-solution interfaces. The two breakpoint times can be utilized to follow simultaneously the concentration changes of the free ionophore, the ion-ionophore complex, and the mobile anionic sites in cation-selective membranes. In membranes with known composition, the time instances where breakpoints occur can be used to estimate the free ionophore and the ion-ionophore complex diffusion coefficients.

KW - Determination of diffusion coefficients

KW - Ion-selective electrodes

KW - Membrane chronopotentiometry

KW - Spectroelectrochemical microscopy

KW - Theoretical treatment

UR - http://www.scopus.com/inward/record.url?scp=73049104048&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=73049104048&partnerID=8YFLogxK

U2 - 10.1016/j.jelechem.2009.11.007

DO - 10.1016/j.jelechem.2009.11.007

M3 - Article

AN - SCOPUS:73049104048

VL - 638

SP - 254

EP - 261

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

SN - 0022-0728

IS - 2

ER -