Reagent Free Electrochemical-Based Detection of Silver Ions at Interdigitated Micro Electrodes Using in Situ pH Control
dc.contributor.author | Wasiewska, Luiza Adela | |
dc.contributor.author | Seymour, Ian | |
dc.contributor.author | Patella, Bernardo | |
dc.contributor.author | Burgess, Catherine | |
dc.contributor.author | Duffy, Geraldine | |
dc.contributor.author | O'Riordan, Alan | |
dc.date.accessioned | 2024-02-18T13:32:20Z | |
dc.date.available | 2024-02-18T13:32:20Z | |
dc.date.issued | 2020-07-10 | |
dc.identifier.citation | Luiza A. Wasiewska, Ian Seymour, Bernardo Patella, Rosalinda Inguanta, Catherine M. Burgess, Geraldine Duffy, Alan O'Riordan, Reagent free electrochemical-based detection of silver ions at interdigitated microelectrodes using in-situ pH control, Sensors and Actuators B: Chemical, Volume 333, 2021, 129531, ISSN 0925-4005, https://doi.org/10.1016/j.snb.2021.129531. | en_US |
dc.identifier.uri | http://hdl.handle.net/11019/3599 | |
dc.description | peer-reviewed | en_US |
dc.description.abstract | Herein we report on the development of an electrochemical sensor for silver ions detection in tap water using anodic sweep voltammetry with in-situ pH control; enabled by closely spaced interdigitated electrode arrays. The in-situ pH control approach allowed the pH of a test solution to be tailored to pH 3 (experimentally determined as the optimal pH) by applying 1.65 V to a protonator electrode with the subsequent production of protons, arising from water electrolysis, dropping the local pH value. Using this approach, an initial proof-of-concept study for silver detection in sodium acetate was undertaken where 1.25 V was applied during deposition (to compensate for oxygen production) and 1.65 V during stripping. Using these conditions, calibration between 0.2 and 10 μM was established with the silver stripping peak ∼0.3 V. The calculated limit of detection was 13 nM. For the final application in tap water, 1.65 V was applied to a protonator electrode for both deposition and stripping of silver. The chloride ions, present in tap water (as a consequence of adding chlorine during the disinfection process) facilitated silver detection and caused the striping peak to shift catholically to ∼0.2 V. The combination of the complexation of silver ions with chloride and in-situ pH control resulted in a linear calibration range between 0.25 and 2 μM in tap water and a calculated limit of detection of 106 nM without the need to add acid or supporting electrolytes. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Elsevier | en_US |
dc.relation.ispartofseries | Sensors and Actuators B: Chemical;Vol 333 | |
dc.rights | Attribution-NonCommercial-ShareAlike 4.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-sa/4.0/ | * |
dc.subject | Silver ions | en_US |
dc.subject | Tap water | en_US |
dc.subject | Square wave voltammetry | en_US |
dc.subject | Local pH control | en_US |
dc.subject | Interdigitated gold microband electrodes | en_US |
dc.title | Reagent Free Electrochemical-Based Detection of Silver Ions at Interdigitated Micro Electrodes Using in Situ pH Control | en_US |
dc.type | Article | en_US |
dc.identifier.doi | https://doi.org/10.1016/j.snb.2021.129531 | |
dc.contributor.sponsor | Teagasc Walsh Scholarship | en_US |
dc.contributor.sponsor | Science Foundation Ireland (SFI) | en_US |
dc.contributor.sponsor | Department of Agriculture, Food and Marine | en_US |
dc.contributor.sponsorGrantNumber | 2016024 | en_US |
dc.contributor.sponsorGrantNumber | 16/RC/3835 | en_US |
refterms.dateFOA | 2024-02-18T13:32:22Z |
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Food Safety [212]