Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study
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 phosp...
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2005
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v39_n2_p585_Barja http://hdl.handle.net/20.500.12110/paper_0013936X_v39_n2_p585_Barja |
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paper:paper_0013936X_v39_n2_p585_Barja2023-06-08T14:36:30Z Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study Barja, Beatriz Carmen 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 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. Fil:Barja, B.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v39_n2_p585_Barja http://hdl.handle.net/20.500.12110/paper_0013936X_v39_n2_p585_Barja |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Barja, Beatriz Carmen Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study |
| topic_facet |
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 |
| description |
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. |
| author |
Barja, Beatriz Carmen |
| author_facet |
Barja, Beatriz Carmen |
| author_sort |
Barja, Beatriz Carmen |
| title |
Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study |
| title_short |
Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study |
| title_full |
Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study |
| title_fullStr |
Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study |
| title_full_unstemmed |
Aminomethylphosphonic acid and glyphosate adsorption onto goethite: A comparative study |
| title_sort |
aminomethylphosphonic acid and glyphosate adsorption onto goethite: a comparative study |
| publishDate |
2005 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v39_n2_p585_Barja http://hdl.handle.net/20.500.12110/paper_0013936X_v39_n2_p585_Barja |
| work_keys_str_mv |
AT barjabeatrizcarmen aminomethylphosphonicacidandglyphosateadsorptionontogoethiteacomparativestudy |
| _version_ |
1768545265436852224 |