| Kinetics and mechanism of the hydrolysis of thiamethoxam. | |
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MedLine Citation:
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PMID: 20183047 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The degradation of thiamethoxam [(EZ)-3-(2-chloro-1,3-thiazol-5-yl-methyl)-5-methyl-1,3,5-oxadiazinan-4-ylidene (nitro) amine] insecticide in buffers at different pH and temperature levels was investigated in laboratory studies. Acidic hydrolysis under conventional heating conditions and alkaline hydrolysis under both conventional heating and microwave conditions were carried out. Different hydrolysis products were found to form under alkaline and acidic conditions. Hydrolysis of thiamethoxam in acidic, neutral and alkaline buffers followed first-order reaction rate kinetics at pH 4, 7 and 9.2, respectively. Thiamethoxam readily hydrolyzed in alkaline buffer but was comparatively stable in neutral buffer solution. The main products formed under different conditions were characterized on the basis of infrared (IR), (1)H-NMR and Mass spectroscopy. The possible mechanisms for the formation of these hydrolysis products have also been proposed. |
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Authors:
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Rajib Karmakar; Shashi B Singh; Gita Kulshrestha |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes Volume: 44 ISSN: 1532-4109 ISO Abbreviation: J Environ Sci Health B Publication Date: 2009 Jun |
Date Detail:
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Created Date: 2010-02-25 Completed Date: 2010-05-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7607167 Medline TA: J Environ Sci Health B Country: England |
Other Details:
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Languages: eng Pagination: 435-41 Citation Subset: IM |
Affiliation:
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Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi -110012, India. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Buffers Chromatography, High Pressure Liquid Hydrogen-Ion Concentration Hydrolysis Insecticides / chemistry* Mass Spectrometry Microwaves Nitro Compounds / chemistry* Oxazines / chemistry* Temperature Thiazoles / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Buffers; 0/Insecticides; 0/Nitro Compounds; 0/Oxazines; 0/Thiazoles; 153719-23-4/thiamethoxam |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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