Adsorption of glyphosate in Chilean soils and its relationship with unoccupied phosphate binding sites

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dc.contributor.authorKogan, M
dc.contributor.authorMetz, A
dc.contributor.authorOrtega, R
dc.date.accessioned2024-01-10T13:45:38Z
dc.date.available2024-01-10T13:45:38Z
dc.date.issued2003
dc.description.abstractThe objective of this work was to investigate glyphosate adsorption by soils and its relationship with unoccupied binding sites for phosphate adsorption. Soil samples of three Chilean soils series-Valdivia (Andisol), Clarillo (Inceptisol) and Chicureo (Vertisol) - were incubated with different herbicide concentrations. Glyphosate remaining in solution was determined by adjusting a HPLC method with a UV detector. Experimental maximum adsorption capacity were 15,000, 14,300 and 4,700 mug g(-1) for Valdivia, Clarillo, and Chicureo soils, respectively. Linear, Freundlich, and Langmuir models were used to describe glyphosate adsorption. Isotherms describing glyphosate adsorption differed among soils. Maximum adjusted adsorption capacity with the Langmuir model was 231,884, 17,874 and 5,670 mug g(-1) for Valdivia, Clarillo, and Chicureo soils, respectively. Glyphosate adsorption on the Valdivia soil showed a linear behavior at the range of concentrations used and none of the adjusted models became asymptotic. The high glyphosate adsorption capacity of the Valdivia soil was probably a result of its high exchangeable Al, extractable Fe, and alophan and imogolite clay type. Adsorption was very much related to phosphate dynamics in the Valdivia soil, which showed the larger unoccupied phosphate binding sites. However relationship between unoccupied phosphate binding sites and glyphosate adsorption in the other two soils (Clarillo and Chicureo) was not clear.
dc.format.extent7 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1590/S0100-204X2003000400010
dc.identifier.issn0100-204X
dc.identifier.urihttps://doi.org/10.1590/S0100-204X2003000400010
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79060
dc.identifier.wosidWOS:000182929100010
dc.information.autorucAgronomía e Ing. Forestal;Kogan M;S/I;98569
dc.issue.numero4
dc.language.isoen
dc.nota.accesoSin adjunto
dc.pagina.final519
dc.pagina.inicio513
dc.publisherEMPRESA BRASIL PESQ AGROPEC
dc.revistaPESQUISA AGROPECUARIA BRASILEIRA
dc.rightsregistro bibliográfico
dc.subjectherbicide
dc.subjectdosage effects
dc.subjectmodels
dc.subjectCLAY-MINERALS
dc.subjectDEGRADATION
dc.subjectMOBILITY
dc.subjectDESORPTION
dc.subjectRESIDUES
dc.subjectSORPTION
dc.subject.ods02 Zero Hunger
dc.subject.odspa02 Hambre cero
dc.titleAdsorption of glyphosate in Chilean soils and its relationship with unoccupied phosphate binding sites
dc.typeartículo
dc.volumen38
sipa.codpersvinculados98569
sipa.indexWOS
sipa.trazabilidadCarga SIPA;09-01-2024
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