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Study of the humic-like compounds formed from L-tyrosine on homoionic clays

Published online by Cambridge University Press:  09 July 2018

M. Bosetto
Affiliation:
Dip. Scienza del Suolo e Nutrizione della Pianta - Universitá di Firenze
P. Arfaioli
Affiliation:
Dip. Scienza del Suolo e Nutrizione della Pianta - Universitá di Firenze
O. L. Pantani
Affiliation:
Dip. Scienza del Suolo e Nutrizione della Pianta - Universitá di Firenze
G. G. Ristori
Affiliation:
Centro di Studio per i Colloidi del Suolo, CNR - Firenze- Piazzale Cascine, 28 - 50144 Firenze, ltaly

Abstract

The ability to produce humic-like polymeric compounds, with L-tyrosine as the starting material, was evaluated using different mineral systems, e.g. on Ca-, A1- and Cu(II)-saturated montmorillonite, nontronite and kaolinite, and on quartz. Clay minerals proved to be effective in the formation of these compounds, but not quartz, except in the presence of Cu(II). The newly formed compounds were fractionated by alkaline extraction. With clay systems, the amounts of substances produced appear to be related more to the interlayer cation than to the clay type. Copper cations appear to be more effective when not associated with the clay structure.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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