Kinetic studies of endosulfan photochemical degradations by ultraviolet light irradiation in aqueous medium

Kinetic studies of endosulfan photochemical degradation in controlled aqueous systems were carried out by ultraviolet light irradiation at λ = 254 nm. The photolysis of (α + β: 2 + 1) endosulfan, α-endosulfan and β-endosulfan were first-order kinetics. The observed rate constants obtained from linea...

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Bibliographic Details
Published in:Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2008-02, Vol.43 (2), p.120-126
Main Authors: Barcelo-Quintal, M.H, Cebada-Ricalde, M.C, Trejo-Irigoyen, A.R, Rendon-Osorio, R.B, Manzanilla-Cano, J.A
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
aqueous solutions
Biological and medical sciences
chemical degradation
differential pulse polarography
Endosulfan
Endosulfan - analysis
Endosulfan - chemistry
Endosulfan - radiation effects
environmental fate
Fundamental and applied biological sciences. Psychology
Insecticides - analysis
Insecticides - chemistry
Insecticides - radiation effects
Kinetics
least squares
nitrogen
organochloride pesticide degradation
Oxidation-Reduction
Photochemistry - methods
Photolysis
pollution
quantum yield
Soil and water pollution
Soil science
Spectrophotometry, Ultraviolet
ultraviolet radiation
Ultraviolet Rays
ultraviolet-visible spectroscopy
UV-Vis spectrophotometry
Water
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Summary:Kinetic studies of endosulfan photochemical degradation in controlled aqueous systems were carried out by ultraviolet light irradiation at λ = 254 nm. The photolysis of (α + β: 2 + 1) endosulfan, α-endosulfan and β-endosulfan were first-order kinetics. The observed rate constants obtained from linear least-squares analysis of the data were 1 × 10 −4 s −1 ; 1 × 10 −4 s −1 ; and 2 × 10 −5 s −1 , respectively, and the calculated quantum yields (φ) were 1, 1 and 1.6, respectively. Preliminary differential pulse polarographic (DPP) analysis allowed to observe the possible endosulfan photochemical degradation pathway. This degradation route involves the formation of the endosulfan diol, its transformation to endosulfan ether and finally the ether's complete degradation by observing the potential shifts.
ISSN:0360-1234
1532-4109
DOI:10.1080/03601230701794992