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| Home > Publications database > Accelerated Degradation of 14C-Atrazine in Brazilian Soils from Different Regions |
| Journal Article | PreJuSER-11177 |
; ; ; ;
2010
American Chemical Society (ACS)
Washington, DC [u.a.]
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Please use a persistent id in citations: doi:10.1021/jf100549d
Abstract: The repeated use of a given pesticide may induce a selection of the soil microbial population, resulting in a rapid degradation of the respective xenobiotic. Patterns of atrazine degradation (mineralization, formation of metabolites and nonextractable residues (NER)) were evaluated in two Brazilian soils with a history of atrazine application. Results were compared with those obtained from soils that had no agricultural use or herbicide application history. (14)C-Atrazine mineralization in unsaturated treated soils was high. By the 85th day of incubation, 82% of the applied (14)C-atrazine was mineralized in the Rhodic Hapludox and 74% in the Xanthic Haplustox. Mineralization remained low in nontreated soils (<or=5.1%). Incubation under slurry conditions enhanced atrazine mineralization in the treated Xantic Haplustox and surprisingly also in the nontreated Rhodic Hapludox (98 and 83% on the 85th day, respectively), whereas in the other samples the evolved (14)CO(2) did not differ (p < 0.05) from the unsaturated conditions. The water-extractable amount of atrazine directly after (14)C-atrazine application was higher in both Xanthic Haplustox samples (around 80% of applied atrazine) in comparison to the Rhodic Hapludox samples (around 60%). Extractable activity and the formation of metabolites and NER varied among the studied soils according to the atrazine application history rather than the soil characteristics.
Keyword(s): Atrazine: analysis (MeSH) ; Brazil (MeSH) ; Carbon Isotopes: analysis (MeSH) ; Herbicides: analysis (MeSH) ; Soil: analysis (MeSH) ; Carbon Isotopes ; Herbicides ; Soil ; Atrazine ; J ; Enhanced biodegradation (auto) ; metabolites (auto) ; desorption (auto) ; herbicide application history (auto)
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