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Voltammetric Behavior of Tembotrione Using Silver/Amalgam Electrode

American Journal of Analytical Chemistry 2013年第1期4卷 44-50页

作者： milica jovic Dragan Manojlovic Dalibor Stankovi? Andelija Milic milica Sentic Goran Roglic Faculty of Chemistry University of BelgradeBelgradeSerbia

Tembotrione is herbicide which belongs to the triketone group of herbicides. It’s registered as a selective, post-emergence herbicide developed for the control of a broad spectrum broadleaf and grassy weeds in corn. There is little information about tembotrione because of his short presence in the market. Due to its ever wider application, it is important to know the details of its chemical characteristics and redox processes, including biogeochemical transformation and migration after application to agricultural land, which could contribute to its efficient and safer application. In this paper we examined voltammetric behavior of tembotrione using Silver/Amalgam (Ag/Hg) electrode. For the investigation of electrochemical behavior we used the cyclic voltammetry technique, with conventional three-electrode cell and electrochemical workstation. During the experiment pH values of solution varieties while constant concentration of tembotrione was maintained. Cyclic voltammograms were recorded at pH values 6, 8, 10 and 12, at which tembotrione was electrochemically active. At this pH values two signals were observed. Optimum pH value, at which the current intensity was greatest, was 12. Obtained results provide relevant information on the electrochemical behavior of tembotrione, which can serve as a basis for the development of electrochemical techniques for the removal and degradation of this pesticide in the environment.

关键词： Pesticide Tembotrione Cyclic Voltammetry Voltammetric Behavior Silver/Amalgam Electrode

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Oxygen Plasma/Bismuth Modified Inkjet Printed Graphene Electrode for the Sensitive Simultaneous Detection of Lead and Cadmium

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American Journal of Analytical Chemistry 2020年第1期11卷 1-14页

作者： Léopoldine Sonfack Guenang Prachi Gupta Victor Costa Basseto milica jovic Ervice Ymélé Andreas Lesch Hubert Girault Ignas Kenfack Tonlé Electrochemistry and Chemistry of Materials Department of Chemistry University of Dschang Dschang Cameroon Inorganic Chemistry Laboratory Department of Chemistry University of Buea Buea Cameroon Laboratoired’ Electrochimie Physique et Analytique (LEPA) Ecole Polytechnique Fédérale de Lausanne Lausanne Switzerland

In this work, a simple procedure for the preparation of an inkjet printed disposable graphene electrode is reported. Commercial graphene ink was printed on a kapton substrate and the resulting electrode was 30 min treated by oxygen plasma, then modified by a bismuth salt. The as prepared electrode was characterized by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), laser scanning microscopy (LSM) and scanning electron microscopy (SEM) coupled to energy-dispersive X-ray spectroscopy (EDX). The sensing properties of the characterized electrodes were then investigated using cyclic voltammetry and Electrochemical Impedance Spectroscopy (EIS). Afterwards, these electrodes were exploited in a comparative way for the electroanalysis of Cadmium(II) and Lead(II) ions. An increase in the electrode sensitivity due to its modification and to the presence of bismuth was observed. Some preliminary experiments based on stripping square wave voltammetry highlighted the interest of using the proposed disposable inkjet printed electrodes for the electrochemical detection of heavy metals in tap water.

关键词： Inkjet Printing Technology Disposable Printed Graphene Electrode Heavy Metals Stripping Voltammetry

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