Chemical structure of humic acids - Part 2, the molecular aggregation of some humic acid fractions in N, N-dimethylformamide

Journal of Research of the U.S. Geological Survey
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Abstract

Humic acid fractions form molecular aggregates in solution. In previous studies we have shown by small angle X-ray scattering that the size of these aggregates is a function of pH. In this study we have found that the size of the aggregates of two humic acid fractions in water and buffers and in dimethylformamide solutions can be changed by oxidation with molecular oxygen and air. These results cast new light on the bonding mechanisms that cause aggregation of the humic acid particles in solution. We have interpreted the changes in aggregation sizes as being brought about by changes in intermolecular and intramolecular hydrogen bonding of the humic particles. Solvation of the humic molecules by dimethylformamide interferes with some of the hydrogen bonding reactions between proton donor and acceptor groups on the same humic acid molecules or on different molecules.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Chemical structure of humic acids - Part 2, the molecular aggregation of some humic acid fractions in N, N-dimethylformamide
Series title Journal of Research of the U.S. Geological Survey
Volume 5
Issue 5
Year Published 1977
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 7 p.
First page 571
Last page 577
Online Only (Y/N) N
Additional Online Files (Y/N) N
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