| Microbial degradation of clomazone under simulated California rice field conditions. | |
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MedLine Citation:
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PMID: 20178392 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Clomazone (trade names Cerano and Command) is a popular herbicide used on California rice fields to control aquatic weeds. Its physicochemical characteristics indicate that it will persist primarily in the water column, where microbial degradation may drive its environmental fate. The objectives were to determine microbial degradation rates and compare the metabolic products under aerobic and anaerobic conditions similar to those in California rice fields during the summer. Time-series samples were extracted and analyzed by LC/MS/MS. Metabolic profiling revealed the following clomazone-derived transitions: m/z 240 --> 125 (clomazone), m/z 242 --> 125 (ring-open clomazone), m/z 256 --> 125 (5-hydroxyclomazone), m/z 256 --> 141 (aromatic hydroxyclomazone), m/z 268 --> 125 (unknown metabolite), and m/z 272 --> 141 (4'5-dihydroxyclomazone). Results indicate an anaerobic half-life of 7.9 days, with ring-open clomazone reaching 67.4% of application at 38 days. Aerobically, clomazone degraded more slowly (t(1/2) = 47.3 days), forming mostly soil-bound residues. Thus, under summer conditions, clomazone is likely to dissipate rapidly from fields via anaerobic degradation. |
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Authors:
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Patrick L Tomco; Dirk M Holstege; Wei Zou; Ronald S Tjeerdema |
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 agricultural and food chemistry Volume: 58 ISSN: 1520-5118 ISO Abbreviation: J. Agric. Food Chem. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-17 Completed Date: 2010-07-15 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: United States |
Other Details:
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Languages: eng Pagination: 3674-80 Citation Subset: IM |
Affiliation:
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Department of Environmental Toxicology, University of California, Davis, Davis, California 95616, USA. ptomco@gmail.com |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biodegradation, Environmental California Herbicides / chemistry, metabolism* Isoxazoles / chemistry, metabolism* Oryza sativa Oxazolidinones / chemistry, metabolism* Soil Microbiology* Soil Pollutants / chemistry, metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Herbicides; 0/Isoxazoles; 0/Oxazolidinones; 0/Soil Pollutants; 81777-89-1/clomazone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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