Yu, Tian and Fenelon, Orla and Herdman, Karen M. and Breslin, Carmel B. (2022) The Electrochemical Detection of 4-chloro-2-methylphenoxyacetic Acid (MCPA) Using a Simple Activated Glassy Carbon Electrode. Journal of the Electrochemical Society, 169 (037514). pp. 1-10. ISSN 0013-4651

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Abstract

4-Chloro-2-methylphenoxyacetic acid (MCPA) is one of the pesticides most widely used to control broadleaf weeds in arable and horticultural crops and it leaches readily into groundwater bodies causing pollution. In this study, a sensor was fabricated by the simple activation of a glassy carbon electrode (GCE) in an aqueous phosphate solution by cycling the GCE between –2.0 and 2.4 V vs SCE. The activated GCE exhibited very good detection of MCPA, with a linear concentration range extending from 1 to 850 μM (cyclic voltammetry) and a limit of detection (LOD) of 0.008 μM, which was obtained using differential pulse voltammetry. A more thermodynamically favoured oxidation of MCPA was observed at the activated GCE, with an approximate shift of 110 mV in the peak potential to lower potentials. Very good reproducibility and stability were achieved, with the sensor giving similar peak currents over a 30-day immersion period. Good selectivity was achieved in the presence of nitrates, nitrites, sulfates and structurally related compounds such as nitro-phenols. The promising performance of the activated GCE in the sensing of MCPA was attributed to the generation of oxygenated functional groups and an increased surface area arising from the local dissolution of the GCE during activation.

Item Type:	Article
Keywords:	Electrochemical Detection; 4-chloro-2- methylphenoxyacetic Acid; MCPA; Activated; Glassy Carbon Electrode;
Academic Unit:	Faculty of Science and Engineering > Chemistry Faculty of Science and Engineering > Research Institutes > Human Health Institute
Item ID:	18270
Identification Number:	https://doi.org/10.1149/1945-7111/ac5c03
Depositing User:	Dr. Carmel Breslin
Date Deposited:	13 Mar 2024 10:48
Journal or Publication Title:	Journal of the Electrochemical Society
Publisher:	Electrochemical Society
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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