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首页> 外文期刊>International Journal of Electrochemistry >Electroanalytical Methodology for the Direct Determination of 2,4-Dichlorophenoxyacetic Acid in Soil Samples Using a Graphite-Polyurethane Electrode
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Electroanalytical Methodology for the Direct Determination of 2,4-Dichlorophenoxyacetic Acid in Soil Samples Using a Graphite-Polyurethane Electrode

机译：石墨-聚氨酯电极直接测定土壤样品中2,4-二氯苯氧基乙酸的电分析方法

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摘要

An electroanalytical methodology was developed for the direct determination of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) using a graphite-polyurethane composite electrode and square wave voltammetry (SWV). 2,4-D exhibited one reduction peak with characteristics of an irreversible process at −0.54 V (versus Ag/AgCl), which is controlled by the diffusion of the reagent on the electrode surface. After the experimental parameters optimization (pH 2.0,f=50 s−1,a=0.50 V, andΔEi=0.03 V), analytical curves were constructed in the range of 0.66 mg L−1to 2.62  mg L−1. Detection (LD) and quantification (LQ) limits were 17.6 μg L−1and 58.6 μg L−1, respectively. The methodology was successfully applied to measure the percolation of the herbicide 2,4-D in undisturbed soil columns of different granulometric compositions.
机译：开发了一种电分析方法，可使用石墨-聚氨酯复合电极和方波伏安法（SWV）直接测定除草剂2,4-二氯苯氧基乙酸（2,4-D）。 2,4-D在-0.54 V处（与Ag / AgCl相比）具有一个不可逆过程的还原峰，这是由试剂在电极表面的扩散所控制的。经过优化实验参数（pH 2.0，f = 50 s-1，a = 0.50 V，ΔEi= 0.03 V），在0.66 mg L-1至2.62 mg L-1的范围内绘制了分析曲线。检出限（LD）和定量限（LQ）分别为17.6μggL-1和58.6μggL-1。该方法已成功地用于测量除草剂2,4-D在不同粒度组成的未扰动土壤柱中的渗透。

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