Electroanalysis of Endosulfan and o -Chlorophenol in Polypyrrole Coated Glassy Carbon Electrode

Direct electroanalytical determination of methylparathion in solution extracted from soil

“…After subsequent cycles, another peak appeared at À0.27 V (peak C) on the cathodic sweep. The process clearly indicated that peak A is responsible for the formation of peaks B and C. Similar results were obtained for a mercury electrode [34] and a nafion-coated glassy carbon electrode [30] for the insecticide parathion and for the insecticide fenitrothion with mercury electrode [36]. In these studies, peak A was attributed to the reduction of the nitro group (-NO 2 ) to a hydroxylamine group (-NHOH) and the redox pair to the oxidation/reduction of the hydroxylamine group to a nitrous group (-NO).…”

“…Modified glassy carbon electrodes have also been employed for pesticides determination [27,33,34]. However, bare glassy carbon electrodes, without any kind of modification, has much more simple use, since no special activation is required for the analysis.…”

Investigation on the Usage of Clay Modified Electrode for the Electrochemical Determination of Some Pollutants

“…This might be due to the electrostatic interaction between the negative nature of electrode at this potential and the radical cation formed because of the elimination of chlorine atom. Compared to previous reports, [19][20][21] lower determination limits are observed with this modified electrode system. A decrease in peak height was observed for accumulation potentials in the negative region.…”

“…In recent years, a number of azo and bis azo dyes have been removed from the list of substances approved for use in foods, drugs, and cosmetics. In continuation to our earlier reports, [19][20][21][22] we describe here the voltammetric behavior of endosulfan (EN), o-chlorophenol (OCP) and direct orange 8 (DO8) using sodium montmorillonite clay modified glassy carbon electrode (NaMM/GCE) in the presence and absence of a surfactant, cetyl trimethyl ammonium bromide (CTAB). The dye, direct orange 8 (Disodium salt of 5-{[4 0 -(1-amino-4-sulfo-2-naphthalenyl)azo]-[(1,1 0 -biphenyl-4-yl)azo]}-2-hydroxybenzoic acid), is a benzidine type dye and is suspected to release harmful amines that are allergenic, carcinogenic or poisonous.…”

New Materials in Electochemical Sensors for Pesticides Monitoring

“…Thus, such in situ surface initiating ATRP provides a remarkable route to tailor the structure and properties of the modified CNTs and a way to construct novel CNT-based hybrid nanomaterials (Kong et al, 2004). Usage of conducting polymers as modifiers is a very promising field (Manisankar et al, 2002;Manisankar et al, 2004) because MWCNTs exhibit excellent electrocatalytic and adsorption properties (Ajayan, 1999) and conducting polymers exhibit preferential accumulation of analytes on bound surface functionalities (Manisankar et al, 2005b). In this sense it has been proposed a multiwalled carbon nanotubes modified glassy carbon electrode, covered with polyaniline and polypyrrole coating for the electrochemical reduction of the herbicide isoproturon, the insecticide voltage and the acaricide dicofol (Manisankar et al, 2008a) or of the insecticides cypermethrin, deltamethrin and fenvalerate (Manisankar et al, 2008b;Siswana et al, 2010) report that nanostructured nickel (II) phthalocyanine/multiwalled carbon nanotubes composite supported on a basal plane pyrolitic electrode, could serve as a viable platform for the sensitive electrocatalytic detection of the carbamate pesticide asulam.…”