Voltammetric Determination of Phenoxybenzyl‐Type Insecticides at Chemically Modified Conducting Polymer‐Carbon Nanotubes Coated Electrodes

Abstract

AbstractThe electrochemical reduction of three common insecticides such as cypermethrin (CYP), deltamethrin (DEL) and fenvalerate (FEN) was investigated at glassy carbon electrode (GCE), multiwalled carbon nanotubes modified GCE (MWCNT‐GCE), polyaniline (herein called as modifier M1) and polypyrrole (herein called as modifier M2) deposited MWCNT/GCE using cyclic voltammetry. Influences of pH, scan rate, and concentration were studied. The surface morphology of the modified film was characterized by scanning electron microscopy (SEM) and X‐ray diffraction analysis (XRD). A systematic study of the experimental parameters that affect differential pulse stripping voltammetry (DPSV) was carried out and the optimized experimental conditions were arrived at. The calibration plots were linear over the insecticide's concentration range 0.1–100 mg L−1 and 0.05–100 mg L−1 for all the three insecticides at MWCNT‐GCE and MWCNT(M1)‐GCE respectively. The MWCNT(M2)‐GCE performed well among the three electrode systems and the determination range obtained was 0.01–100 mg L−1 for CYP, DEL and FEN. The limit of detection (LOD) was 0.35 μg L−1, 0.9 μg L−1 and 0.1 μg L−1 for CYP, DEL and FEN respectively on MWCNT(M2)‐GCE modified system. Suitability of this method for the trace determination of insecticide in spiked soil sample was also determined.