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Título: | Glyphosate adsorption on soils of different characteristics. Influence of copper addition |
Autor: | Morillo González, Esmeralda CSIC ORCID ; Undabeytia López, Tomás CSIC ORCID ; Maqueda Porras, Celia CSIC; Ramos, Blas Antonio | Fecha de publicación: | 2000 | Editor: | Pergamon Press | Citación: | Chemosphere 40(1): 103-107 (2000) | Resumen: | Results of glyphosate (GPS) adsorption on three soils of different characteristics show that the interaction of this pesticide with the soils was not related to their CEC and clay minerals content, but to the content of iron and aluminum amorphous oxides and organic matter. The presence of Cu in treatment solutions enhanced GPS adsorption, due to several reasons: GPS coordinates strongly to Cu, and Cu-GPS complexes formed seem to have higher ability to be adsorbed on the soil than free GPS; GPS adsorption can take place on sites where Cu was previously adsorbed, acting as a bridge between the soil and GPS; when Cu was present the solution pH decreased, and GPs adsorption increased, since lower pHs lead to the formation of GPS species with lower negative charge, which are adsorbed more easily on the negatively charged soil surfaces. | URI: | http://hdl.handle.net/10261/62040 | DOI: | 10.1016/S0045-6535(99)00255-6 | Identificadores: | doi: 10.1016/S0045-6535(99)00255-6 issn: 0045-6535 e-issn: 1879-1298 |
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