Abstract
Employing a graphene-modified glassy carbon electrode, a sensitive and convenient electrochemical method for the determination of phoxim by linear sweep voltammetry was developed. The electrochemical behavior of phoxim at the modified electrode was studied by cyclic voltammetry. In citric acid–phosphate buffers, the modified electrode exhibited excellent electrocatalytical effect on the reduction of phoxim and this was further used for the determination of phoxim. Under optimized analytical conditions, the reduction peak current showed a linear relationship with the concentration of phoxim in a range of 5.97 to 5,966 μg L−1, with a correlation coefficient of 0.9993 and a detection limit of 2.39 μg L−1. The proposed method shows excellent sensitivity, selectivity, and linearity and has been successfully applied for the determination of phoxim in a variety of food samples with satisfactory results.
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Acknowledgements
This work was financially supported by a project of Shandong Province Higher Educational Science and Technology Program (J12LD53) and Heze University Scientific Research Fund (XY12BS07).
Conflict of Interest
Mingyong Chao declares that he has no conflict of interest. Meifeng Chen declares that she has no conflict of interest. This article does not contain any studies with human or animal subjects.
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Chao, M., Chen, M. Electrochemical Determination of Phoxim in Food Samples Employing a Graphene-Modified Glassy Carbon Electrode. Food Anal. Methods 7, 1729–1736 (2014). https://doi.org/10.1007/s12161-014-9813-y
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DOI: https://doi.org/10.1007/s12161-014-9813-y