影响银旋转电极差分脉冲伏安法测定百草枯的参数

A. Farahi , S. Lahrich , M. Achak , L. El Gaini , M. Bakasse , M.A. El Mhammedi
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引用次数: 17

摘要

介绍了在固体旋转银电极(RSE)上用微分脉冲伏安法测定水中百草枯PQ(II)的电化学方法。这项工作的目的是优化所有可能影响这一决定的因素。研究了电位波形、电位扫描参数和沉积时间对百草枯峰形状和强度的影响。采用差分脉冲伏安法,在0.1 mol L−1 Na2SO4为负载电解质时,在振幅为50 mV、扫描增量为5 mV、沉积时间为120 s、频率为50 s−1、阶跃振幅为0.05 V的条件下,获得了最佳响应。电化学和机械表面清洗旨在去除沉积在银表面的百草枯,这是获得良好电极性能所必需的。并对响应线性度、重复性、准确度和检出限进行了评价。峰1和峰2的检出限分别为7.1 × 10−9 mol L−1和2.8 × 10−9 mol L−1。在1.0 × 10−4 mol L−1百草枯条件下,相对标准偏差(RSD)为1.19%。成功地证明了RSE在牛奶样品中测定PQ(II)的适用性,无需任何样品预处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Parameters affecting the determination of paraquat at silver rotating electrodes using differential pulse voltammetry

The electrochemical determination of aqueous paraquat PQ(II) by differential pulse voltammetry at a solid rotating silver electrode (RSE) is described. The aim of this work is to optimize all factors that can influence this determination. Potential wave forms, potential scan parameters and deposition time were examined for their effect on the paraquat peak shape and intensity. The best responses were obtained with differential pulse voltammetry in 0.1 mol L−1 Na2SO4 as supporting electrolyte using amplitude 50 mV, scan increment 5 mV, deposition time 120 s, frequency 50 s−1 and step amplitude 0.05 V. Electrochemical and mechanical surface cleaning, aimed at removing the amount of paraquat deposited onto the silver surface, were necessary for obtaining a good performance of the electrode. Response linearity, repeatability, accuracy and detection limit were also evaluated. The obtained detection limits were 7.1 × 10−9 mol L−1 and 2.8 × 10−9 mol L−1 for peak 1 and peak 2 respectively. The relative standard deviation (RSD) was found to be 1.19% in 1.0 × 10−4 mol L−1 paraquat. The applicability of the RSE for PQ(II) determination in milk samples, without any sample pretreatment, was successfully demonstrated.

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