Thin-Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection

M G Afshar; G A Crespo; Eric Bakker

doi:10.1002/anie.201500797

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Thin-Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection

Journal article

Peer reviewed

Thin-Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection

M G Afshar, G A Crespo and Eric Bakker

Angewandte Chemie, Vol.54(28), pp.8110-8113

2015

DOI: https://doi.org/10.1002/anie.201500797

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Abstract

Chemical Sciences

alkalinity

coulometry

proton pump

thin-layer systems

titration

We report a general concept based on a selective electrochemical ion pump used for creating concentration perturbations in thin layer samples (∼40 μL). As a first example, hydrogen ions are released from a selective polymeric membrane (proton pump) and the resulting pH is assessed potentiometrically with a second membrane placed directly opposite. By applying a constant potential modulation for 30 s, an induced proton concentration of up to 350 mM may be realized. This concept may become an attractive tool for in situ titrations without the need for sampling, because the thin layer eventually re-equilibrates with the contacting bulk sample. Acid-base titrations of NaOH and Na2CO3 are demonstrated. The determination of total alkalinity in a river water sample is carried out, giving levels (23.1 mM) comparable to that obtained by standard methods (23.6 mM). The concept may be easily extended to other ions (cations, anions, polyions) and may become attractive for environmental and clinical applications. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Details

Title: Thin-Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection
Authors: M G Afshar (Author) - University of Geneva, Switzerland
G A Crespo (Author) - University of Geneva, Switzerland
Eric Bakker (Author) - University of Geneva, Switzerland
Publication details: Angewandte Chemie, Vol.54(28), pp.8110-8113
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
Date published: 2015
DOI: 10.1002/anie.201500797
ISSN: 0044-8249
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449925502621
Output Type: Journal article

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Web Of Science research areas: Chemistry, Multidisciplinary