Application of an exfoliated graphite nanoplatelet-modified electrode for the determination of quintozen |
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Authors: | Ion Ion Alina Catrinel Ion Alina Culetu |
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Affiliation: | University Politehnica of Bucharest, Department of Analytical Chemistry, Polizu Street No. 1-7, Bucharest, Romania |
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Abstract: | A chitosan–grafted exfoliated graphite nanoplatelet (xGnP) hybrid chemically modified electrode was developed and characterized for the determination of organochlorine pesticides with nitro groups using quintozen as a representative. The hybrid material was characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–VIS) and scanning electron microscopy (SEM). The electrochemical properties of the chitosan–xGnP modified electrode were characterized by a physical deposition method for depositing it on a graphite electrode. Because of the affinity of the xGnP for nitro groups, nitroaromatic organophosphate pesticides are attached to the surface, allowing the extraction of quintozen within a short time (4 min). The differential pulse response was linear over the quintozen concentration range of 10?12–10?6 M, and the current linearly increased with the quintozen concentrations in two concentration ranges: from 10?12 to 10?8 M with the linear regression equation of y = 0.0423x + 0.6451, R2 = 0.9964 and from 10?8 to 10?6 M with the linear regression equation of y = 0.0085x + 0.303, R2 = 0.9952, with a detection limit of 10?11 M. |
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