Square-wave stripping voltammetric determination of some organic pollutants using modified electrodes

Abstract

A glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes (MWCNT) and polymer/MWCNT composite was used to study the voltammetric behaviour of three common insecticides namely cypermethrin (CYP), deltamethrin (DEL) and fenvalerate (FEN). The modified electrode surface was characterised by scanning electron microscopy (SEM). The voltammograms of the above mentioned pollutants were studied in the pH range 1-13. Influence of scan rate () was also studied. One well-defined reduction peak was observed for all the said insecticides at pH 13. A systematic study of the experimental parameters such as accumulation potential, accumulation time, initial scan potential, amplitude and frequency that affect the square-wave stripping voltammetric response was carried out and maximum peak current conditions were optimised. Under optimum conditions, stripping voltammetric procedure was developed for the determination of above-mentioned insecticides in conventional and real samples. Calibration plots were derived and the lower limit of determination was found. Sensing of polypyrrole/MWCNT/GCE well among the three electrode systems and the limit of detection (LOD) was found to be 1.17, 3.8 and 1.62 mg L À1 for CYP, DEL and FEN, respectively. The percentage of relative standard deviation was also found.

Enhanced Sensing of 4-Nitroso-N,N–Dimethyl Aniline using Multi-Walled Carbon Nano Tube Modified Glassy Carbon Electrode

“…Khani et al employed multi-walled carbon nano tubesionic liquid-carbon paste electrode as a super selectivity sensor for the voltammetric determination of mercury ion (II) in aqueous solution [24]. Adsorption and electrochemical reduction of pyrantelpamoate was studied at hanging mercury drop electrode by Gupta et al employing adsorptive stripping voltammetric technique [25] and Manisankar et al investigated square-wave stripping voltammetric determination of insecticides using MWCNT and polymer/MWCNT composite electrodes [26].…”

Voltammetric Analysis of Montelukast Sodium in Commercial Tablet and Biological Samples Using the Hanging Mercury Drop Electrode

“…It certainly constitutes the most useful technique for a preliminary determination of the redox properties of a given species [5]. There have been many reviews devoted to emphasize and illustrate the wide spectrum and scope of AdSV applications and potentialities in the analysis of metal ions [6][7][8][9][10], food analysis [11], organic analytes [12,13] and pharmaceutical drugs and biomedical compounds [14][15][16][17][18][19][20][21][22][23][24][25]. Montelukast (trade names Singulair and Montelo-10) is a leukotriene receptor antagonist (LTRA) used for the maintenance treatment of asthma and to relieve symptoms of seasonal allergies.…”

A simple square wave voltammetric method for the determination of aclonifen herbicide

“…3 Sulfonylurea, diphenylether, and sulfonanilide herbicides were chromatographically separated using reversed-phase liquid chromatography-tandem mass spectrometry and selectively analyzed by MS/MS. 6 Some electrochemical methods such as differential pulse polarography (DPP), [7][8][9] square wave voltammetry (SWV) [10][11][12] or techniques involving biosensors 13,14 are also recommend for pesticide determination. However, a literature survey showed that no approach has been found for the square wave voltammetric behavior of aclonifen (Scheme 1) or its determination in soil, water samples and herbicide formulation.…”