Nonenzymatic Electrochemical Determination of Paraoxon Ethyl in Water and Fruits by Graphene-Based NiFe Bimetallic Phosphosulfide Nanocomposite as a Superior Sensing Layer
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A highly sensitive nonenzymatic electrochemical sensor is designed for stripping voltammetric determination of paraoxon ethyl (PE) as a model for nitroaromatic organophosphates (OPs). Graphene-based NiFe bimetallic phosphosulfide nanocomposite is used for the first time as a novel electrocatalytic modifier for enhancing the electrochemical signal of PE. As a consequence of the efficient π-π stacking interactions between the aromatic structure of OPs and graphene and also due to the strong electrocatalytic properties of the bimetallic phosphosulfide, PE can strongly bind to the surface of modified glassy carbon electrodes and provide a dramatically enhanced voltammetric signal in a nonenzymatic determination method. Maximum square wave voltammetric (SWV) signals were obtained when the adsorption step was completed via 5-min convection at 1000 rpm in an analyte solution with the adjusted pH of 6. The SWV signal of PE was highly linear over the range of 12.3–10,000 nmol L−1 and with the detection limit of 3.7 nmol L−1 (S/N = 3). The developed sensor shows good reproducibility (RSD = 5.2%, N = 10). The study offers a promising application for bimetallic phosphosulfide compounds for developing fast, simple, and highly sensitive nonenzymatic determination protocol for nitroaromatic OPs.
KeywordsNonenzymatic determination Electrochemical sensor Paraoxon ethyl Organophosphates Modified electrodes Pesticide residual
The authors gratefully acknowledge the support of this work by the Research Council of Baqiyatallah University of Medical Sciences.
Compliance with Ethical Standards
Conflict of Interest
Ali Aghaei declares that he has no conflict of interest. Akbar Khanmohammadi declares that he has no conflict of interest. Ali Hajian declares that he has no conflict of interest. Ulrich Schmid declares that he has no conflict of interest. Hasan Bagheri declares that he has no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
For this type of study, informed consent is not required.
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