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Abstract:

Glyphosate is a non-selective, broad spectrum, post-emergent herbicide widely used in weed control. Aminomethylphosphonic acid (AMPA) is one of the main products of biodegradation of glyphosate in natural systems before its ultimate mineralization and also the breakdown product of more complex phosphonates such as nitrilotris-(methylenephosphonic acid). The adsorption isotherms and surface coverage of AMPA and glyphosate (N-phosphomethylglycine, PMG) in aqueous suspensions of goethite as a function of pH were measured. Electrophoretic mobility curves for the PMG/goethite system were also determined. The ATR-FTIR interfacial spectra of the surface complexes of AMPA and PMG onto goethite were analyzed as a function of the pH and the surface coverage. The phosphonate moiety of these two ligands coordinates to the iron oxide surface with similar structures as the methylphosphonic acid despite the presence of the amino and/or carboxylate groups of their molecules. Two predominating complexes have been identified where the phosphonate group in PMG or AMPA bonds monodentately or bridges bidentately to the surface of iron oxide in an inner sphere mode, while the carboxylate and amino group are noncoordinated to the surface. The stability constants of the surface complexes ≡ FeO-P(O)(OH)-R, ≡FeO-P(O)2-R, and (≡FeO) 2-P(O)-R were calculated using the constant capacitance model.

Registro:

Documento: Artículo
Título:Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study
Autor:Barja, B.C.; Dos Santos Afonso, M.
Filiación:Departamento de Quimica Inorganica, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, (C1428EHA) Buenos Aires, Argentina
Palabras clave:Adsorption; Biodegradation; Molecules; pH; Product development; Suspensions (fluids); Weed control; Aminomethylphosphonic acid (AMPA); Glyphosate; Mineralization; Phosphonates; Organic acids; aminomethylphosphonic acid; ferric hydroxide; glyphosate; herbicide; phosphonic acid derivative; goethite; adsorption; article; complex formation; electrophoretic mobility; Fourier transformation; infrared spectroscopy; ionic strength; pH; soil; weed control; Adsorption; Glycine; Herbicides; Iron; Iron Compounds; Phosphonic Acids; Temperature
Año:2005
Volumen:39
Número:2
Página de inicio:585
Página de fin:592
DOI: http://dx.doi.org/10.1021/es035055q
Título revista:Environmental Science and Technology
Título revista abreviado:Environ. Sci. Technol.
ISSN:0013936X
CODEN:ESTHA
CAS:aminomethylphosphonic acid, 1066-51-9; ferric hydroxide, 11113-66-9, 12022-37-6, 12181-28-1, 1309-33-7, 1310-14-1, 1317-60-8, 1317-63-1; glyphosate, 1071-83-6; aminomethylphosphonic acid; Glycine, 56-40-6; glyphosate, 1071-83-6; goethite, 1310-14-1; Herbicides; Iron Compounds; Iron, 7439-89-6; Phosphonic Acids
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v39_n2_p585_Barja

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Citas:

---------- APA ----------
Barja, B.C. & Dos Santos Afonso, M. (2005) . Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study. Environmental Science and Technology, 39(2), 585-592.
http://dx.doi.org/10.1021/es035055q
---------- CHICAGO ----------
Barja, B.C., Dos Santos Afonso, M. "Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study" . Environmental Science and Technology 39, no. 2 (2005) : 585-592.
http://dx.doi.org/10.1021/es035055q
---------- MLA ----------
Barja, B.C., Dos Santos Afonso, M. "Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study" . Environmental Science and Technology, vol. 39, no. 2, 2005, pp. 585-592.
http://dx.doi.org/10.1021/es035055q
---------- VANCOUVER ----------
Barja, B.C., Dos Santos Afonso, M. Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study. Environ. Sci. Technol. 2005;39(2):585-592.
http://dx.doi.org/10.1021/es035055q