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首页> 外文期刊>Dynamic Biochemistry, Process Biotechnology and Molecular Biology >Assessment of Multiwalled Carbon Nanotube Paste Electrode for Square-Wave Adsorptive Cathodic Stripping Voltammetric (SWAdCSV) Determination of Methyl Parathion in Water Samples
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Assessment of Multiwalled Carbon Nanotube Paste Electrode for Square-Wave Adsorptive Cathodic Stripping Voltammetric (SWAdCSV) Determination of Methyl Parathion in Water Samples

机译：方波吸附阴极溶出伏安法（SWAdCSV）测定水样中甲基对硫磷的多壁碳纳米管粘贴电极的评估

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In this paper the assessment of an electrode composed by multiwalled carbon nanotube (MWCNT) dispersed in mineral oil as well as its application on the electrochemical determination of methyl parathion (MP) in environmental water samples by square-wave adsorptive cathodic stripping voltammetry (SWAdCSV) is described. The suitability of the electrode for this purpose was confirmed by comparing it to a glassy carbon electrode (GCE) and to a carbon paste electrode (CPE). A 7.1- and 3.4-fold increase ofthe signal, respectively, was achieved. In order to obtain the best performance of the method, significant factors were established by a factorial design and the method optimized by employing the Doehlert matrix. Based on these chemometric tools the following experimental conditions were selected: 7.95, 70 mV, 205 Hz and 0.3 mol L~(-1), respectively, for sample pH, PA, F and BC. A study of interferences was conducted through the addition of inorganic ions NO_3~-, SO_4~(2-), PO_4~(3-) and Mn~(2+) duringMP analysis and no interference was noted. The method presented a linear range between 0.56 and 18.00 umol L~4 (r = 0.995), limit of detection (LD) of 0.15 mu mol.L~(-1) and limit of quantification (LQ) of 0.49 umol.L~(-1). The determination of MP on environmental spiked samples showed good recovery values and repeatability.
机译：本文对分散在矿物油中的多壁碳纳米管（MWCNT）组成的电极的评估及其在方波吸附阴极溶出伏安法（SWAdCSV）电化学测定环境水样中甲基对硫磷（MP）中的应用描述。通过将其与玻璃状碳电极（GCE）和碳糊电极（CPE）进行比较，确认了该电极的适用性。信号分别增加了7.1倍和3.4倍。为了获得该方法的最佳性能，通过阶乘设计确定了重要因素，并通过使用Doehlert矩阵对方法进行了优化。基于这些化学计量工具，选择了以下实验条件：样品pH，PA，F和BC分别为7.95、70 mV，205 Hz和0.3 mol L〜（-1）。在MP分析过程中，通过添加无机离子NO_3〜-，SO_4〜（2-），PO_4〜（3-）和Mn〜（2+）进行了干扰研究，未发现干扰。该方法的线性范围为0.56至18.00 umol L〜4（r = 0.995），检出限（LD）为0.15μmol.L〜（-1），定量限（LQ）为0.49 umol.L〜 （-1）。环境加标样品中MP的测定显示出良好的回收率和可重复性。

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