Photodegradation of the herbicide penoxsulam in aqueous methanol and acetonitrile.

Abstract

Penoxsulam is a triazolopyrimidine sulfonamide group of rice herbicide.

The phototransformation of penoxsulam was studied under UV light (lambda max >or= 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.

Full Text

• DOI - Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes (DOI)
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Subjects

• Acetonitriles
• Herbicides
• Kinetics
• Methanol
• Oxidation-Reduction
• Photochemistry
• Sulfonamides
• Titanium
• Ultraviolet Rays
• Uridine
• Water

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Authors

• Sukhendu K Pramanik
• Saktipada Das
• Anjan Bhattacharyya

Publication date

2008-09-22

Journal

Journal topics

• Agriculture
• Environmental Pollutants
• Food Contamination
• Pesticides

Language

Eng.

Copyright

Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes

Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, West Bengal, India. skpramanik [at] gmail.com

Release reference

J Environ Sci Health B. 2008 Sep;43(7):569-75

Related books

• Books of Acetonitriles
• Books of Agriculture
• Books of Environmental Pollutants
• Books of Food Contamination
• Books of Herbicides
• Books of Kinetics
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• Books of Oxidation-Reduction
• Books of Pesticides
• Books of Photochemistry
• Books of Sulfonamides
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