Journal article
Direct Detection of Acidity, Alkalinity, and pH with Membrane Electrodes
Analytical Chemistry, Vol.84(23), pp.10165-10169
2012
Abstract
An electrochemical sensing protocol based on supported liquid ion-selective membranes for the direct detection of total alkalinity of a sample that contains a weak base such as Tris (pK(a) = 8.2) is presented here for the first time. Alkalinity is determined by imposing a defined flux of hydrogen ions from the membrane to the sample with an applied current. The transition time at which the base species at the membrane-sample interface depletes owing to diffusion limitation is related to sample alkalinity in this chronopotentiometric detection mode. The same membrane is shown to detect pH (by zero current potentiometry) and acidity and alkalinity (by chronopotentiometry at different current polarity). This principle may become a welcome tool for the in situ determination of these characteristics in complex samples such as natural waters.
Details
- Title
- Direct Detection of Acidity, Alkalinity, and pH with Membrane Electrodes
- Authors
- G A Crespo (Author) - University of Geneva, SwitzerlandM G Afshar (Author) - University of Geneva, SwitzerlandEric Bakker (Author) - University of Geneva, Switzerland
- Publication details
- Analytical Chemistry, Vol.84(23), pp.10165-10169
- Publisher
- American Chemical Society
- Date published
- 2012
- DOI
- 10.1021/ac302868u
- ISSN
- 0003-2700
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450388102621
- Output Type
- Journal article
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- Web Of Science research areas
- Chemistry, Analytical