Investigation of Voltammetric Behavior of Herbicide N,N’-Ethylene- 2,2’-Bipyridinium using the Copper Modified Carbon Paste Electrode

IF 0.7 Q4 CHEMISTRY, ANALYTICAL

Methods and Objects of Chemical Analysis Pub Date : 2022-01-01 DOI:10.17721/moca.2022.28-33

M. Oubenali, Hayat El ouafy, Mouna Aamor, M. Mbarki, Aziz El Haimouti, T. EL Ouafy

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引用次数: 0

Abstract

The reactivity of Diquat ion at the carbon paste electrode (C.P.E) modified by the copper (C.P.E-Cu) has been reported. The working electrode was prepared by mixing the copper with the carbon powder. The optimal potential window has been selected in the range from -1 V to 1.5 V. The effect of parameters such as pH, scan rate, preconcentration time and concentration has been studied by cyclic voltammetry. The preconcentration time is 13 minutes. The reactivity of Diquat on the electrochemical detector has been characterized by the appearance of the cathodic peak at 0.6 V in a solution of sodium sulfate (pH 3). Catalytic influence has been examined by cyclic voltammetry and electronic impedance spectroscopy. The calculated limits of detection and quantification have been 9.48·10-6 and 3.16·10-6 mol L-1, respectively. Then relative standard deviation (RSD) at 0.8·10-4 mol L-1 of Diquat was 5.77 % for nine repetitions. The analytical application was done in the determination of Diquat in real samples of apple juice with satisfying results.

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用铜修饰碳糊电极研究除草剂N,N ' -乙烯- 2,2 ' -联吡啶的伏安行为

报道了Diquat在铜修饰的碳糊电极(cpe - e - cu)上的反应性。将铜与碳粉混合制成工作电极。在-1 V ~ 1.5 V范围内选择了最佳电位窗。采用循环伏安法研究了pH、扫描速率、预富集时间和浓度等参数对反应的影响。集中时间为13分钟。Diquat在电化学检测器上的反应性通过在pH为3的硫酸钠溶液中出现0.6 V的阴极峰来表征。通过循环伏安法和电子阻抗谱检查了催化影响。计算检测限和定量限分别为9.48·10-6和3.16·10-6 mol L-1。在0.8·10-4 mol L-1 Diquat条件下，9次重复的相对标准偏差(RSD)为5.77%。将该方法应用于实际苹果汁中Diquat的测定，结果令人满意。

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来源期刊

Methods and Objects of Chemical Analysis CHEMISTRY, ANALYTICAL-

CiteScore

1.00

自引率

14.30%

发文量

期刊介绍： The journal "Methods and objects of chemical analysis" is peer-review journal and publishes original articles of theoretical and experimental analysis on topical issues and bio-analytical chemistry, chemical and pharmaceutical analysis, as well as chemical metrology. Submitted works shall cover the results of completed studies and shall make scientific contributions to the relevant area of expertise. The journal publishes review articles, research articles and articles related to latest developments of analytical instrumentations.