Abstract
Potentiometric 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.
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