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Speciation of N-(phosphonomethyl)glycine (glyphosate) in aqueous solutions containing major components of natural fluids |
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| Authors: | Lorenzo Abate Placido Mineo Carmelo Rigano Pier G. Daniele Enrico Prenesti Concetta De Stefano |
| Affiliation: | 1. Dipartimento di Scienze Chimiche dell'Università, Viale A. Doria 6, I-95125 Catania, Italy;2. Dipartimento di Chimica Analitica dell'Università, Via P. Giuria 5, I-10125 Torino, Italy;3. Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica dell'Università, Salita Sperone 31, I-98166 Messina (Vill. S. Agata), Italy |
| Abstract: | ABSTRACTPotentiometric measurements in different media and at different temperatures were performed in order to determine protonation constants of glyphosate and formation constants for Ca2+ and Mg2+ complexes, together with their dependence on ionic strength and ?H0 values. Calorimetric measurements were also performed to determine ?H0 of protonation. Potentiometric measurements in mixed Ca2+ and Mg2+ solution allowed us to determine the formation of a mixed metal species. Thermodynamic parameters reported in this work can be used for studying the complete speciation of glp in electrolyte solutions containing the major ionic components of natural fluids. |
| Keywords: | N-(phosphonomethyl)glycine (glyphosate) herbicide |