Method development and application for triazine herbicides analysis in water,soil and sediment samples from KwaZulu-Natal |
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Authors: | S. C. Ntombela |
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Affiliation: | Department of Chemistry, University of KwaZulu Natal, Pietermaritzburg, South Africa |
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Abstract: | Penoxsulam is a triazolopyrimidine sulfonamide group of rice herbicide. The phototransformation of penoxsulam was studied under UV light (λmax ≥ 290 nm) and sunlight in aqueous methanol and acetonitrile solvent system using TiO2 as sensitizer. The rate of photodegradation of penoxsulam in different solvent systems followed first-order kinetics and calculated half-lives was found to be in the range of 51.89–73.41 h and 62.70–97.09 h for UV light and sunlight respectively in the presence or absence of sensitizer. From this study, a total of six photoproducts were identified and characterized on the basis of Q-Tof micromass spectral data. The plausible mechanism of phototransformation involved were hydrolysis, photo oxidation of the sulfonamide group, breaking of sulfonamide bond, loss of amino and sulfonic acid group. |
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Keywords: | Environmental samples solid phase extraction ultrasonic extraction liquid chromatography |
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