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Title: PVC-based ion-selective electrodes with a silicone rubber outer coating with improved analytical performance
Authors: Joon, Narender Kumar
He, Ning
Ruzgas, Tautgirdas
Bobacka, Johan
Lisak, Grzegorz
Keywords: Science::Chemistry::Analytical chemistry
Issue Date: 2019
Source: Joon, N. K., He, N., Ruzgas, T., Bobacka, J. & Lisak, G. (2019). PVC-based ion-selective electrodes with a silicone rubber outer coating with improved analytical performance. Analytical Chemistry, 91(16), 10524-10531.
Journal: Analytical Chemistry 
Abstract: An outer layer of pure silicone rubber (SR), i.e. SR without any plasticizer, ionophore, or lipophilic anion, was applied on top of a conventional poly(vinyl chloride) (PVC) based K+-selective membrane in a solid-contact ion-selective electrode (SC-ISE). The influence of the outer SR coating on the analytical performance of the K+-ISEs was studied. The presence of the SR coating did not affect the selectivity of the SC-ISE, indicating that the plasticizer, ionophore, and lipophilic anion are spontaneously distributed from the PVC-based membrane into the SR layer. This was confirmed by electrochemical impedance spectroscopy (EIS). Interestingly, the reproducibility of the standard potential of the conditioned SC-ISE was significantly improved from E0 ± 35.3 mV to E0 ± 3.5 mV simply by adding the SR coating on top of the plasticized PVC based K+-selective membrane. Moreover, the adsorption of bovine serum albumin (BSA) was significantly reduced at the SR coated ion-selective membrane. Thus, the addition of a SR coating on a plasticized PVC ion-selective membrane seems to be a feasible method to improve the analytical performance and to reduce the biofouling of potentiometric ion sensors.
ISSN: 1520-6882
DOI: 10.1021/acs.analchem.9b01490
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Analytical Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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