Humic substances cont

Piccolo, A., Celano, G., and Conte, P. Adsorption of gl3q)hosphate by humic substances, J. Agric. Food Chem., 44(8) 2442-... 

Piccolo, A., and P. Conte, Molecular size of humic substances. Supramolecular associations versus macromolecular polymers , Advances in Environ. Res., 3, 508-521 (2000). 

Spaccini, R., Piccolo, A., Conte, P., Haberhauer, G., and Gerzabek, M. H. (2002). Increased soil carbon sequestration through hydrophobic protection by humic substances. Soil Biol. Biochem. 34,1839-1851. 

Three different viewpoints on the humic substances structural conformation are actually reported in the literature. One suggests that HS are macromolecular and assume random coil conformations in solution (Swift, 1999) a second proposes that HS are molecular associations of relatively small molecules held together by weak interaction forces, thus forming a supramolecular structure (Piccolo and Conte, 1999) a third considers that HS are in solution as micelles or pseudomicellar structures (Wershaw, 1999). Viewpoints two and three could be broadly considered to be under the same umbrella (Clapp and Hayes, 1999). 

Conte, P., Piccolo, A., Van Lagen, B., Buurman, P, and de Jager, P A. (1997). Quantitative aspects of solid-state C-13-NMR spectra of humic substances from soils of volcanic systems. Geoderma 80, 327-338. 

Piccolo, A., Conte, P, and Cozzolino, A. (1999). Effects of mineral and monocarboxyhc acids on the molecular association of dissolved humic substances. Eur. J. Soil Sci. 50, 687-694. 

Conte, P., and Piccolo, A. (1999). Conformational arrangement of dissolved humic substances. Influence of solution composition on association of humic molecules. Environ. Sci. Technol. 33(10), 1682-1690. 

PesticidelSoil Interaction, ed. J. Cornejo and P. Jamet, Institut National de la Recherche Agronomique, Paris, France, 2000 R196 A. Piccolo, G. Celano and P. Conte, Methods of Isolation and Characterization of Humic Substances to Study their Interaction with Pesticides , p. 103... 

Piccolo, A., G. Celano, and P. Conte. 1996. Adsorption of glyphosate by humic substances. Journal of Agricultural and Food Chemistry 44, no. 8 2442-2446. doi 10.1021/ jf950620x. 

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