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

Abstract

Laser-reduced graphene oxide (LRGO) on a polyethylene terephthalate (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 the electrode surface and increasing the electrochemical sensitivity for carbaryl determination. Carbaryl is electrochemically irreversibly oxidized at 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 linear scan voltammetry (LSV) on the LRGO grid electrode with a scan rate of 300 mV/s. Some interference of the juice matrix molecules does 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. The fabrication of the LRGO grid electrode opens up possibilities for further inexpensive monitoring of carbaryl in other fruit juices and fruits

Unveiling the effect of crystallinity and particle size of biogenic Ag/ZnO nanocomposites on the electrochemical sensing performance of carbaryl detection in agricultural products

“…This peak could be assigned to the carbaryl oxidation which is consistent with some previous reports regarding the oxidation peak of CBR. 12,41 Fig. 6b shows a bar plot of the irreversible oxidation peak current response for CBR for all modified electrodes.…”

Pioneering electrochemical detection unveils erdafitinib: a breakthrough in anticancer agent determination

“…The findings obtained from this inquiry, combined with those gleaned from the pH scan analysis, provide evidence supporting the requirement for the simultaneous transition of one electron and one proton during the electrochemical oxidation of ERD. The potential oxidation mechanism of ERD on NPCS/GCE is schematized (Scheme 1 ) [ 107 , 108 ].

Scheme 1 The possible oxidation reaction of ERD

…”

Fe3O4 Nanoparticle/Graphene Oxide Composites as Selective Probes and Self-Matrixes for Pesticide Detection by Electrochemistry and Laser Desorption/Ionization Mass Spectrometry

“…However, the very low concentration of the presented pesticide is undetectable without spiking with standard CBZ and CBF as shown in Figure S11a (Supporting Information). In the analytical approach, spiking the known concentration of pesticides into the real sample matrices is a common method used for proof of concept prior to applying a newly developed platform for real sample analysis. , The tolerance of the method was investigated by spiking the concentration of CBZ and CBF higher than the cutoff limit of pesticides in fruits, as suggested by the previous study . 10 μL of different concentrations of CBZ and CBF was added to the as-prepared pear sample for real matrix analysis.…”

“…58,59 The tolerance of the method was investigated by spiking the concentration of CBZ and CBF higher than the cutoff limit of pesticides in fruits, as suggested by the previous study. 60 10 μL of different concentrations of CBZ and CBF was added to the as-prepared pear sample for real matrix analysis. The percent recovery was determined (Table 1).…”