A Highly Sensitive Electrochemical Sensor Based on Electrocatalytic Reduction Effect of Cu2+ on Trace Determination of Malathion in Soil and Other Complex Matrices

IF 2.3 Q3 ELECTROCHEMISTRY International journal of electrochemistry Pub Date : 2021-12-24 DOI:10.1155/2021/8110364
F. Alshareef, M. Orif, E. A. Al-Harbi, M. El-Shahawi
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引用次数: 3

Abstract

The current strategy reports a highly sensitive and selective square wave-cathodic stripping voltammetric protocol for malathion determination. The established method was based on the controlled adsorptive accumulation of malathion in the presence of Cu2+ ions in an aqueous solution of pH 2 onto the hanging mercury dropping electrode (HMDE) and measuring the resulting cathodic peak current of the adsorbed species at −0.42 V versus Ag/AgCl electrode. The low limits of detection (LOD) and quantification (LOQ) of malathion of the assay were estimated to be 3.1 × 10−10 and 1.03 × 10−9 M with a linear dynamic range of 1.03×10−9 – 2.0 × 10−7 M, respectively. The method was satisfactorily applied and validated for malathion determination in environmental samples. The experimental Student texp and Fexp values did not exceed the tabulated ttab (2.78) and Ftab (6.39) at 95% (P = 0.05) confidence (n = 5), confirming the precision and independence on the matrix. The developed sensing platform for the detection of malathion shows superior performance to conventional electrochemical methods. The proposed sensor offered simple, economical, reproducible, and applicable approach for the determination of malathion in environmental samples.
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基于Cu2+电催化还原效应的高灵敏电化学传感器测定土壤及其它复杂基质中微量马拉硫磷
目前的策略报告了一种高灵敏度和选择性的方波阴极溶出伏安法马拉硫磷测定方案。建立的方法是基于在pH为2的水溶液中Cu2+存在时马拉硫磷在悬垂垂汞电极(HMDE)上的可控吸附积累,并测量吸附物质在−0.42 V与Ag/AgCl电极的阴极峰值电流。马拉硫磷的检测下限(LOD)和定量下限(LOQ)分别为3.1 ×10−10和1.03×10−9 M,线性动态范围为1.03×10−9 ~ 2.0 ×10−7 M。该方法可用于环境样品中马拉硫磷的测定。实验Student文本和Fexp值在95% (P = 0.05)置信度(n = 5)下未超过表列tab(2.78)和Ftab(6.39),证实了对矩阵的精度和独立性。研制的马拉硫磷检测传感平台性能优于传统的电化学检测方法。该传感器为环境样品中马拉硫磷的测定提供了简单、经济、重复性好、适用的方法。
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审稿时长
7 weeks
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