Some structural and electronic features of the interaction of phosphate with metal-humic complexes

Journal of Agricultural and Food Chemistry
Iñaki GuardadoJose M Garcia-Mina

Abstract

Previous studies demonstrated the formation of stable phosphate-metal-humic complexes in solution. These studies, however, indicated that the proportion of complexed metal that intervenes in phosphate fixation is rather low. In this study we investigate the possible structural and electronic features of the binding site involved in phosphate fixation in metal-humic complexes that could explain this fact. To this end, we have studied phosphate-metal-humic complexes involving Fe(III), Al(III), and Zn(II) using three complementary techniques: infrared spectroscopy (FTIR), fluorescence, and molecular modeling. The FTIR study indicated that, in the case of those complexes involving Fe and Zn phosphate, fixation is associated with a stabilization of the metal-carboxylate bond. In the case of Al this effect is less clear. This effect of phosphate fixation on the characteristics of the metal-humic binding site was also supported by the results obtained in the Fluorescence study, which showed significant changes in the quenching effect normally associated with metal complexation in humic substances upon phosphate fixation. Finally, the molecular modeling study revealed that the stability of phosphate-metal-humic complexes is inversely r...Continue Reading

Citations

Feb 4, 2012·Journal of Agricultural and Food Chemistry·Javier ErroJose M Garcia-Mina
Mar 1, 2011·Chemosphere·Cristina Pérez-NovoManuel Arias-Estévez
Oct 12, 2010·Journal of Hazardous Materials·C Pérez-NovoM Arias-Estévez
May 15, 2013·ChemSusChem·Roberto BaigorriJosé María Garcia-Mina
Jul 15, 2015·Journal of Plant Nutrition and Soil Science = Zeitschrift Für Pflanzenernährung Und Bodenkunde·Jens KrusePeter Leinweber
May 4, 2010·Environmental Science & Technology·Prasesh SharmaAndreas Kappler
Oct 12, 2011·Environmental Science & Technology·Christian Mikutta, Ruben Kretzschmar

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