Evaluation Of Carbon Paste Electrode Modified With Heavy Metals For The Analysis Of Paracetamol By Voltammetry And Impedance Spectroscopy

IF 0.7 Q4 CHEMISTRY, ANALYTICAL

Methods and Objects of Chemical Analysis Pub Date : 2020-01-01 DOI:10.17721/moca.2020.93-99

Hayat E.L.Ouafy, T. E. Ouafy, M. Oubenali, M. Mbarki, M. Echajia

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引用次数: 3

Abstract

The present document reports on the electrocatalytic activity of heavy metals (Copper(II), Nickel(II), Manganese(II) and Lead(II)) modified carbon paste electrodes (HM/CPE) for the paracetamol (Pr) oxidation where its results are compared with carbon paste electrode. The voltammetric behavior of Pr is explored where a sensitive anodic peak has appeared at about 0.27 V (vs. Ag/AgCl/3 M KCl) in 0.1 M Na2SO4 (pH 12). This peak results from the irreversible oxidation of Pr at HM/CPE surface. The catalytic effect was evaluated using cyclic and square wave voltammetry. Electrochemical impedance spectroscopy also confirms our experimental results as the HM/CPE shows the least charge transfer resistance. Also, HM/ CPE can be utilized successfully to ameliorate the electroanalysis of Pr at very weak concentration with excellent sensitivity. The calibration curves were linear from 6.0 · 10-5 to 8.0 · 10-4 mol L-1. The detection limits were found approaching 10-9 mol L-1. Then, the proposed method was applied to detect Pr in river water samples with satisfactory results.

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用伏安法和阻抗法评价重金属修饰碳糊电极对乙酰氨基酚的分析

本文报道了重金属(铜(II)、镍(II)、锰(II)和铅(II))修饰的碳糊电极(HM/CPE)对扑热息痛(Pr)氧化的电催化活性，并将其结果与碳糊电极进行了比较。在0.1 M Na2SO4 (pH 12)中，Pr的伏安行为在0.27 V (vs. Ag/AgCl/3 M KCl)处出现了一个敏感的阳极峰。这个峰是由HM/CPE表面Pr的不可逆氧化引起的。用循环伏安法和方波伏安法评价了催化效果。电化学阻抗谱也证实了我们的实验结果，HM/CPE表现出最小的电荷转移电阻。此外，HM/ CPE还能以优异的灵敏度改善极弱浓度下的Pr电分析。标定曲线在6.0·10-5 ~ 8.0·10-4 mol L-1范围内呈线性关系。检出限接近10-9 mol L-1。将该方法应用于河流水样中Pr的检测，结果令人满意。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.