Mineralization and Metabolism of the Herbicide Isouron in Aqueous Environment

The herbicide isouron [3-(5-tert-butyl-3-isoxazolyl)-1, 1-dimethylurea] was mineralized to 31 and 25% in sewage samples at 0.01 and 0.1ppm, respectively, but only 7% was mineralized in river-water samples in a 120-day period. Although most of the radioactivity remained, only 66 to 68% of the initial...

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Bibliographic Details
Published in:Journal of Pesticide Science 1991/02/20, Vol.16(1), pp.19-25
Main Authors: WANG, Yei-Shung, TSAI, Hsien-Shiow, SU, Yung-Ho, CHEN, Yuh-Lin
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Ecotoxicology, biological effects of pollution
Fresh water environment
Fundamental and applied biological sciences. Psychology
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Summary:The herbicide isouron [3-(5-tert-butyl-3-isoxazolyl)-1, 1-dimethylurea] was mineralized to 31 and 25% in sewage samples at 0.01 and 0.1ppm, respectively, but only 7% was mineralized in river-water samples in a 120-day period. Although most of the radioactivity remained, only 66 to 68% of the initial isouron was found in the river-water samples. Data suggest that isouron was converted mainly to organic compounds, presumably by metabolism. Mineralization occurred in microbial environments prevailing in the seawage. A partial pathway involved in the microbial degradation of isouron in the aqueous environments is proposed. Metabolites, 3-(5-tert-butyl-3-isoxazolyl)-1-methyl-1-formylurea and N-[5-(1, 1-dimethyl-2-hydroxyethyl)-3-isoxazolyl]carbamic acid were identified in the sewage samples, these two compounds were not previously found among metabolic products of isouron in soils.
ISSN:1348-589X
0385-1559
1349-0923
DOI:10.1584/jpestics.16.19