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Geochemical Transactions

, 2:16

First Online: 13 February 2001Received: 03 January 2001Accepted: 29 January 2001

Abstract

The ability of six humic acids HAs to form pseudomicellar structures in aqueous solution was evaluated by five techniques: size exclusion chromatography; pyrene fluorescence enhancement; the pyrene I1-I3 ratio; the cloud point of dilute HA solutions; and the fluorescence anisotropy of HAs. Soil HAs were found to aggregate most easily, both on microscopic and macroscopic scales. The formation of amphiphilic structures was chiefly related to HA-solvent interactions: highly solvated HAs aggregated poorly, while a lignite derived material underwent intermolecular, rather than intramolecular, rearrangements. A newly discovered algal HA was found to have minimal aggregative properties.

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Autor: Christi Young - Ray von Wandruszka

Fuente: https://link.springer.com/



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