Dissipation of 2,4-d in Soils of the Humid Pampa Region, Argentina: a Microcosm Study.
From: Microbiología Industrial y Biotecnología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires Junín 956 (1113), Ciudad Autónoma de Buenos Aires, Argentina.
Chemosphere
- Publish Date: Jun 2007
- ISSN: 0045-6535
- Volume: 68
- Issue: 2
- Pages: 259-65
- Medium: Print
- Language: English
- Citation (JAMA): Merini Luciano J, Cuadrado Virginia, Flocco Cecilia G, et al. Dissipation of 2,4-d in Soils of the Humid Pampa Region, Argentina: a Microcosm Study.. Chemosphere Jun 2007;68:259-65
Abstract
Phenoxy herbicides like 2,4-dichlorophenoxyacetic acid (2,4-D) are widely used in agricultural practices. Although its half life in soil is 7-14d, the herbicide itself and its first metabolite 2,4-dichlorophenol (2,4-DCP) could remain in the soil for longer periods, as a consequence of its intensive use. Microcosms assays were conducted to study the influence of indigenous microflora and plants (alfalfa) on the dissipation of 2,4-D from soils of the Humid Pampa region, Argentina, with previous history of phenoxy herbicides application. Results showed that 2,4-D was rapidly degraded, and the permanence of 2,4-DCP in soil depended on the presence of plants and soil microorganisms. Regarding soil microbial community, the presence of 2,4-D degrading bacteria was detected even in basal conditions in this soil, possibly due to the adaptation of the microflora to the herbicide. There was an increment of two orders of magnitude in herbicide degraders after 15d from 2,4-D addition, both in planted and unplanted microcosms. Total heterotrophic bacteria numbers were about 1x10(8) CFUg(-1) dry soil and no significant differences were found between different treatments. Overall, the information provided by this work indicates that the soil under study has an important intrinsic degradation capacity, given by a microbial community adapted to the presence of phenoxy herbicides.
Mesh Headings (Keywords): 2,4-Dichlorophenoxyacetic Acid, Argentina, Bacteria, Biodegradation, Environmental, Ecosystem, Environmental Monitoring, Herbicides, Humic Substances, Medicago sativa, Soil Microbiology, Soil Pollutants
Check for Full Text / PubMed Unique Identifier (PMID): 17316752
This abstract is part of PubMed, a service of the U.S. National Library of Medicine. PubMed includes more than 17 million citations from MEDLINE and other life science journals for biomedical articles. See Copyright and Disclaimers.
Linked medical terms appearing on this page are added by Healia to help readers find more information and are not part of the original PubMed document.
The data herein was last updated on July 8th, 2008 and may not reflect the most current and accurate data available from NLM.