Photodegradation of Oryzalin in aqueous isopropanol and acetonitrile |
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| Authors: | Sukhendu Kumar Pramanik Soumen Joarder Saktipada Das Sankhajit Roy |
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| Institution: | 1. Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal, India;2. Department of Chemistry, University of Kalyani, Kalyani, Nadia, West Bengal, India;3. Chemical Laboratory, Raghunathpur Thermal Power Station (Phase-I;4. 2×600?MW), Damodar Valley Corporation, Raghunathpur, Purulia, West Bengal, India;5. Department of Chemistry, University of Kalyani, Kalyani, Nadia, West Bengal, India |
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| Abstract: | The phototransformation of Oryzalin was studied under UV light (λmax ≥ 290 nm) and sunlight (λmax ≥ 250 nm) in aqueous isopropanol and acetonitrile solution in absence and presence of TiO2 as sensitizer. The rate of photodegradation of Oryzalin in different solvent system followed first-order kinetics, and calculated half-lives were found to be in the range of 23.52-53.75 h for UV light and 41.23-61.43 h for sunlight. From this study, total 12 photoproducts were identified and characterized on the basis of column chromatography and Q-Tof micromass spectral data. The plausible mechanism of phototransformation involved was hydrolysis, breaking of sulfonic bond, and loss of amino and sulfonic acid group. |
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| Keywords: | Oryzalin photoproduct isopropanol acetonitrile titanium dioxide UV light sunlight |
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