Sequential injection differential pulse voltammetric method based on screen printed carbon electrode modified with carbon nanotube/Nafion for sensitive determination of paraquat

Talanta
Prakit ChuntibJaroon Jakmunee

Abstract

The screen-printed carbon electrode (SPCE) modified with various nanoparticles has been studied for using as a working electrode in voltammetric technique. The electrochemical behavior of paraquat on different electrodes was studied by cyclic voltammetry (CV), and then differential pulse voltammetry (DPV) has been employed for trace analysis of paraquat based on redox reaction which the peak current was directly proportional to the concentration of paraquat in the solution. The SPCE modified with carbon nanotube dispersed in Nafion and ethanol (SPCE-CNT/Nafion) gave the best result. Sequential injection-differential pulse voltammetric (SI-DPV) method has been developed for more automated analysis and to reduce chemical consumption. The parameters affecting the SI-DPV system such as step potential, modulation amplitude, flow rate, and concentration of sodium chloride as an electrolyte were studied to improve the sensitivity. Under the optimum condition of the system, i.e., Nafion concentration of 1% (w/v), volume of CNT suspension of 2µL, flow rate of 100µLs-1, step potential of 5mV, modulation amplitude of 100mV and concentration of sodium chloride of 1M, a linear calibration graph in the range of 0.54-4.30µM with a good R2 of ...Continue Reading

References

Aug 6, 1998·Journal of the American Society for Mass Spectrometry·V Y TaguchiD T Wang
Nov 21, 1998·Journal of Chromatography. B, Biomedical Sciences and Applications·H S LeeS K Lee
Oct 25, 2006·Journal of Chromatographic Science·Raquel Rial-OteroManuel Arias-Estévez
Oct 31, 2008·Talanta·M K RaiV K Gupta
Jul 8, 2014·Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences·Xiao-Lin RuanYong-Qiang Lai

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Citations

Apr 8, 2020·Biosensors·Beatriz Pérez-FernándezAlfredo de la Escosura- Muñiz
Jan 20, 2021·Journal of Fluorescence·Zeinab PourghobadiHakimeh Zare
Jan 23, 2020·ACS Applied Materials & Interfaces·Qian ZhaoChun Zhang

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