Fate of a Sulfonylurea Herbicide in an Alluvial Soil, as Shown by Experimental Degradation of Pyrimidine-2- super(14)C-Labeled Rimsulfuron

Chemical hydrolysis and biodegradation have been shown to be the most important degradation pathways for sulfonylurea herbicides in soils. An alluvial soil was treated with rimsulfuron selectively labeled with carbon-14 on the pyrimidine ring to assess the influence of microbial activity on the tran...

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Bibliographic Details
Published in:Chemosphere (Oxford) 1996-08, Vol.33 (4), p.625-625
Main Authors: Metzger, LOY, Munier-Lamy, C, Chone, T, Belgy, M-H, Andreux, F, Vedy, J-C
Format: Article
Language:English
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Summary:Chemical hydrolysis and biodegradation have been shown to be the most important degradation pathways for sulfonylurea herbicides in soils. An alluvial soil was treated with rimsulfuron selectively labeled with carbon-14 on the pyrimidine ring to assess the influence of microbial activity on the transformation of this molecule. The experimental protocol is detailed. Results showed that the biomineralization of rimsulfuron into carbon dioxide reached 2% of the added radioactivity after 77 d. No significant mineralization occurred under abiotic conditions. The non-extractable residues were located mainly in the 0 50- mu m fraction, which suggested that the initial molecule was incorporated into the organo-mineral fraction of the soil. During soil incubation, the number of fungal strains increased substantially over time, reaching a plateau within 50 d, whereas the number of bacteria showed no significant increase.
ISSN:0045-6535