Journal
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
Volume 140, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.trac.2021.116277
Keywords
Potentiometry; Calibration-free; Electrochemistry; Solid contact; Ion-selective electrodes
Categories
Funding
- National Science Foundation [CHE-1710024]
- Kenneth E. & Marion S. Owens Endowed Fellowship from the University of Minnesota
- Swiss State Secretariat for Education, Research and Innovation
- National Science Foundation
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Research in recent years has focused on the development of solid-contact ISEs for calibration-free measurements in long-term, in situ analysis. This review discusses the definition of calibration-free usage and relevant literature, with a focus on different mechanisms of ion-to-electron signal transduction and different types of transduction modes.
In recent years, an important aspect of research into the improvement of ion-selective electrodes (ISEs) has been the development of solid-contact ISEs for calibration-free measurements, with the goal of sensors that can be implemented with ease for long-term, in situ analysis with very limited or no maintenance. This review discusses the definition of the term calibration-free in this context, and it gives suggestions as to what types of information should be reported if a claim of calibration-free usage is made. Relevant literature in this field is reviewed, with a focus on different mechanisms of ion-toelectron signal transduction. Different types of redox-active, capacitive, and mixed-mechanism transduction modes are discussed in view of the reproducibility and stability of the potential responses they provide. (C) 2021 Elsevier B.V. All rights reserved.
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