Electrochemical behavior of parent and photodegradation products of some selected pesticides

Abstract

Recebido em 9/4/07; aceito em 15/2/08; publicado na web 31/7/08Electrochemical behavior of pesticides is extensively studied, but little attention has been given to the study of their degradation products (by-products) by electrochemical methods. However, the degradation products of pesticides can be even more toxic then the parent products and such studies should be encouraged. Therefore, the objective of this work was to evaluate the electroactivity of by-products of imazaquin, methylparathion, bentazon and atrazine, generated by UV irradiation and measured using cyclic and differential pulse voltammetry and UV-visible absorption spectrophotometry. Results have shown that several by-products exhibit electroactivity, allowing, in some cases, the simultaneous determination of both parent and degradation products.

Electrochemical Determination of the Herbicide Bentazone Using a Carbon Nanotube β‐Cyclodextrin Modified Electrode

“…Electroanalytical techniques have been shown to be very useful in the study of toxic substances, used for disease and pest control, such as pesticides, mainly because of environmental concerns such as the contamination of water resources [14][15][16][17]. The use of a bare glassy carbon electrode for the detection of bentazone in commercial samples has already been reported [18].…”

Simple SPE–HPLC determination of some common drugs and herbicides of environmental concern by pulsed amperometry

“…The data obtained for DC mode analysis indicate that for E ¼1.3 V, S/N ratios close to those obtained at pH 5 can be obtained for bentazone (50) and carbamazepine (150) but not for HPPH (20). E ¼1.4 V is the compromise potential for the S/N ratios for HPPH (102), bentazone and carbamazepine.…”

“…Electroanalytical techniques have been shown to be useful in the study of toxic substances of environmental concerns such as pesticides [20] and they have been recently used in pulsed amperometric mode also on glassy carbon electrodes for the determination of chlorophenols [21]. When coupled to chromatography, the specificity of the electrochemistry techniques is increased significantly.…”

Recent Applications of Mercury Electrodes for Monitoring of Pesticides: A Critical Review

“…It can lead to ring contraction, ring expansion, ring opening, or to formation of dimers . Atrazine is an example of this mechanism (Fig. X).…”

“…As mentioned above, a lot of attention in this content is devoted to the development of advanced and non‐traditional electrode materials suitable for specific environmental applications . Recent developments in electroanalytical chemistry are further focused on the development of “smart” electrodes modified by various chemical, biological, or nanoparticles‐based systems.…”