Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

Version 1 : Received: 7 July 2021 / Approved: 9 July 2021 / Online: 9 July 2021 (10:15:49 CEST)

A peer-reviewed article of this Preprint also exists.

Saqib, M.; Dorozhko, E.V.; Barek, J.; Vyskocil, V.; Korotkova, E.I.; Shabalina, A.V. A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl. Molecules 2021, 26, 5050. Saqib, M.; Dorozhko, E.V.; Barek, J.; Vyskocil, V.; Korotkova, E.I.; Shabalina, A.V. A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl. Molecules 2021, 26, 5050.

Journal reference: Molecules 2021, 26, 5050
DOI: 10.3390/molecules26165050

Abstract

Laser reduced graphene oxide (LRGO) on a PET substrate was prepared in one-step to obtain the LRGO grid electrode for sensitive carbaryl determination. The grid form results in a grid distribution of different electrochemically active zones affecting the electroactive substance diffusion towards to the electrode surface and increasing the electrochemical sensitivity for carbaryl determination. Carbaryl is electrochemically irreversibly oxidized by the secondary amine moiety of the molecule with the loss of one proton and one electron in the pH range from 5 to 7 by LSV on the LRGO grid electrode with a scan rate of 300 mV/s. Some interference of the juice matrix molecules did not significantly affect the LSV oxidation current of carbaryl on the LRGO grid electrode after adsorptive accumulation without applied potential. The LRGO grid electrode can be used for LSV determination of carbaryl in fruit juices in the concentration range from 0.25 to 128 mg/L with LOD of 0.1 mg/L by. The fabrication of the LRGO grid electrode opens up possibilities for further inexpensive monitoring of carbaryl in other fruit juices and fruits.

Keywords

laser reduced graphene oxide, grid electrode, graphene oxide, linear sweep voltammetry, carbaryl, pesticides.

Subject

CHEMISTRY, Analytical Chemistry

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