Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning

A 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...

Full description

Saved in:
Bibliographic Details
Main Authors: Cheong, Yi Heng, Ge, Liya, Zhao, Nahong, Teh, Lay Kuan, Lisak, Grzegorz
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2022
Subjects:
Online Access:https://hdl.handle.net/10356/155265
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-155265
record_format dspace
spelling sg-ntu-dr.10356-1552652022-03-07T06:53:54Z Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning Cheong, Yi Heng Ge, Liya Zhao, Nahong Teh, Lay Kuan Lisak, Grzegorz School of Civil and Environmental Engineering Robert Bosch (South East Asia) Pte Ltd Residues and Resource Reclamation Centre Nanyang Environment and Water Research Institute Engineering::Civil engineering Ion Selective Electrode Potential Stability A 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. Economic Development Board (EDB) National Environmental Agency (NEA) Y. 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]. 2022-03-07T06:53:53Z 2022-03-07T06:53:53Z 2020 Journal Article Cheong, 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-. https://dx.doi.org/10.1016/j.jelechem.2020.114262 1572-6657 https://hdl.handle.net/10356/155265 10.1016/j.jelechem.2020.114262 2-s2.0-85085578911 870 114262 en NEA/ETD/ R&DPROJ/CTWL-2018-4D-03 Journal of Electroanalytical Chemistry © 2020 Elsevier B.V. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Ion Selective Electrode
Potential Stability
spellingShingle Engineering::Civil engineering
Ion Selective Electrode
Potential Stability
Cheong, Yi Heng
Ge, Liya
Zhao, Nahong
Teh, Lay Kuan
Lisak, Grzegorz
Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning
description A 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.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Cheong, Yi Heng
Ge, Liya
Zhao, Nahong
Teh, Lay Kuan
Lisak, Grzegorz
format Article
author Cheong, Yi Heng
Ge, Liya
Zhao, Nahong
Teh, Lay Kuan
Lisak, Grzegorz
author_sort Cheong, Yi Heng
title Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning
title_short Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning
title_full Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning
title_fullStr Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning
title_full_unstemmed Ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning
title_sort ion selective electrodes utilizing a ferrocyanide doped redox active screen-printed solid contact - impact of electrode response to conditioning
publishDate 2022
url https://hdl.handle.net/10356/155265
_version_ 1726885515999838208