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dc.contributor.authorCheong, Yi Hengen_US
dc.contributor.authorGe, Liyaen_US
dc.contributor.authorZhao, Nahongen_US
dc.contributor.authorTeh, Lay Kuanen_US
dc.contributor.authorLisak, Grzegorzen_US
dc.identifier.citationCheong, Y. H., Ge, L., Zhao, N., Teh, L. K. & Lisak, G. (2020). Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning. Journal of Electroanalytical Chemistry, 870, 114262-.
dc.description.abstractA novel sensing system was developed using a ferrocyanide-doped screen-printed carbon electrode as an ion-to-electron transducer in ion-selective electrodes (ISEs), which were further applied as a model system to investigate the possibility of a calibration-limited measurement approach for potassium. The novel sensing system offers high piece-to-piece standard potential reproducibility between K+-ISEs in the operational/plant fertilizer ion activity range of 10−1 to 10−4 M K+ (s.d. 0.7 to 3.6 mV, n = 3). Stable potential readings (± 2.8 mV) were found for electrodes conditioned in deoxygenated solutions (from 6 h to 27 h) and in solutions exposed to air (12 to 36 h). The importance of optimizing electrode conditioning to achieve stable limited-calibration measurements was indicated. The direction and magnitude of the potential drift of the ISEs were ultimately found to be dependent on the presence of O2 in the solution and hydration of the ISE. This reflects how the initial redox state of ISEs employing redox-active molecules could be perturbed by the environment. The new design of the ISEs was finally used to conduct a limited-calibration measurement of potassium in fertilizer solutions with a low drift (< 3 mV) at 24 h compared against an initial calibration conducted at 6 h.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.description.sponsorshipNational Environmental Agency (NEA)en_US
dc.relationNEA/ETD/ R&DPROJ/CTWL-2018-4D-03en_US
dc.relation.ispartofJournal of Electroanalytical Chemistryen_US
dc.rights© 2020 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Civil engineeringen_US
dc.titleIon selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioningen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.organizationRobert Bosch (South East Asia) Pte Ltden_US
dc.contributor.researchResidues and Resource Reclamation Centreen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.subject.keywordsIon Selective Electrodeen_US
dc.subject.keywordsPotential Stabilityen_US
dc.description.acknowledgementY. H. Cheong gratefully acknowledges the funding from the Economic Development Board (EDB) of Singapore's Industrial Postgraduate Program in support of this work. This work was also supported by the National Environment Agency; NEA; Singapore under the Urban Solutions and Sustainability (USS) Integration Fund [Project Reference No.: NEA/ETD/ R&DPROJ/CTWL-2018-4D-03].en_US
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