Abstract
The construction and study of solid-contact acetate-selective electrodes is described using a 1,3-bis(carbazolyl)urea derivative as a neutral hydrogen-bonding ionophore and poly(3,4-ethylenedioxythiophene) as the solid contact. It was shown recently that this ionophore binds acetate (logK(ass)=4.98) that is used as primary ion in this study. The electrodes show linearity over the activity range of 10(-4.50)-10(-1.10) with a sub-Nernstian slope of -51.3 mV per decade and a detection limit of 10(-5.00). The anion-selectivity pattern of these electrodes deviates markedly from the Hofmeister pattern. When adding ionophore to the membrane the logarithm of the selectivity coefficient (logK) for SCN- decreased from 6.5 to 1.2, logK for I- decreased from 5.7 to 0.9, logK for NO3- decreased from 4.3 to 0.6 and logK for Br- decreased from 3.3 to 0.1. The selectivity coefficients of hydrophilic anions such as Cl-, F-, HPO42-, and SO42- are significantly lower than in case of the ionophore-free membrane. It was discovered that the constructed electrodes are also relatively selective to bicarbonate. This work is an important step towards the further development of solid-contact anion-selective electrodes.
Original language | Undefined/Unknown |
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Pages (from-to) | 1061–1066 |
Number of pages | 6 |
Journal | Electroanalysis |
Volume | 31 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2019 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Conducting materials
- 4-ethylenedioxythiophene)
- Poly(3
- Acetate recognition
- Ionophores
- Solid-contact anion-selective electrode
Equipment
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Åbo Akademi Functional Printing Center
Toivakka, M. (PI), Rosenholm, J. (PI), Anttu, N. (PI), Bobacka, J. (PI), Huynh, T. P. (PI), Peltonen, J. (PI), Wang, X. (PI), Wilen, C.-E. (PI), Xu, C. (PI), Zhang, H. (PI) & Österbacka, R. (PI)
Faculty of Science and EngineeringFacility/equipment: Facility