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Title: Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes
Authors: Cheong, Yi Heng
Sagar, Kaushal
Lisak, Grzegorz
Keywords: Engineering::Environmental engineering
Issue Date: 2021
Source: Cheong, Y. H., Sagar, K. & Lisak, G. (2021). Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes. Sensors and Actuators B: Chemical, 349, 130766-.
Journal: Sensors and Actuators B: Chemical
Abstract: In this work, the lipophilic salt tetradodecylammonium tetrakis(4-chlorophenyl)borate (ETH 500) was incorporated into a polyvinylidene fluoride (PVDF) matrix. This was subsequently used as a binder in a carbon composite solid contact for ion selective electrodes. The ability of ETH 500 to establish reproducible potentials when added to a batch of solid contact ion selective electrodes (SC-ISEs) is disputed in the literature. We address the discrepancy by showing that blending of the salt in binder prevents uncontrolled partitioning of solid contact components to the solvent during the membrane deposition step, resulting in reproducible SC-ISEs. Model potassium selective SC-ISEs in a batch reproduced their standard potentials EI0 with a standard deviation of 1.3 mV at a low salt loading of 3 wt% ETH 500 in the binder. We also show that establishing a SC composition that is far from equilibrium with the ISM can also introduce a slow partition of charged species over more than a month in storage. By further optimizing the composition of the binder, increased hydrophobicity, reduced drift during storage and a shortened time to ready can be obtained, verifying the versatility of such an approach.
ISSN: 0925-4005
DOI: 10.1016/j.snb.2021.130766
Schools: School of Civil and Environmental Engineering 
Research Centres: Residues and Resource Reclamation Centre 
Nanyang Environment and Water Research Institute 
Rights: © 2021 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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