Glyphosate adsorption on soils of different characteristics. Influence of copper addition
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.
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Pergamon Press
2000
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Online Access: | http://hdl.handle.net/10261/62040 http://dx.doi.org/10.13039/501100007273 |
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dig-irnas-es-10261-620402018-09-13T10:12:12Z Glyphosate adsorption on soils of different characteristics. Influence of copper addition Morillo González, Esmeralda Undabeytia López, Tomás Maqueda Porras, Celia Ramos, Blas Antonio Comisión Interministerial de Ciencia y Tecnología, CICYT (España) 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. The authors acknowledge the Comisión Interministerial de Ciencia y Tecnologı́a (CICYT) for financial support of this work through Projects AMB95-0904 and AMB97-0692. Peer Reviewed 2012-12-05T10:56:47Z 2012-12-05T10:56:47Z 2000 2012-12-05T10:56:47Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/S0045-6535(99)00255-6 issn: 0045-6535 e-issn: 1879-1298 Chemosphere 40(1): 103-107 (2000) http://hdl.handle.net/10261/62040 10.1016/S0045-6535(99)00255-6 http://dx.doi.org/10.13039/501100007273 en none Pergamon Press |
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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. |
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Comisión Interministerial de Ciencia y Tecnología, CICYT (España) |
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Comisión Interministerial de Ciencia y Tecnología, CICYT (España) Morillo González, Esmeralda Undabeytia López, Tomás Maqueda Porras, Celia Ramos, Blas Antonio |
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Morillo González, Esmeralda Undabeytia López, Tomás Maqueda Porras, Celia Ramos, Blas Antonio |
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Morillo González, Esmeralda Undabeytia López, Tomás Maqueda Porras, Celia Ramos, Blas Antonio Glyphosate adsorption on soils of different characteristics. Influence of copper addition |
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Morillo González, Esmeralda |
title |
Glyphosate adsorption on soils of different characteristics. Influence of copper addition |
title_short |
Glyphosate adsorption on soils of different characteristics. Influence of copper addition |
title_full |
Glyphosate adsorption on soils of different characteristics. Influence of copper addition |
title_fullStr |
Glyphosate adsorption on soils of different characteristics. Influence of copper addition |
title_full_unstemmed |
Glyphosate adsorption on soils of different characteristics. Influence of copper addition |
title_sort |
glyphosate adsorption on soils of different characteristics. influence of copper addition |
publisher |
Pergamon Press |
publishDate |
2000 |
url |
http://hdl.handle.net/10261/62040 http://dx.doi.org/10.13039/501100007273 |
work_keys_str_mv |
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1777664453597200384 |