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- W1566631867 endingPage "134" @default.
- W1566631867 startingPage "57" @default.
- W1566631867 abstract "The scientific understanding of the molecular structure of humic substances is critically reviewed here. The traditional view that humic substances are polymers in soil is not substantiated by any direct evidence but only assumed on the basis of laboratory experiments with model molecules and unwarranted results by incorrectly applying either analytical procedures or mathematical treatments developed for purified and undisputed biopolymers. A large body of evidence instead shows an alternative understanding of the conformational nature of humic substances which should be regarded as supramolecular associations of self-assembling heterogeneous and relatively small molecules deriving from the degradation and decomposition of dead biological material. A major aspect of the humic supramolecular structure is that it is predominantly stabilized by weak dispersive forces instead of covalent linkages. Hydrophobic (van der Waals, π-π, CH-π) and hydrogen bonds are responsible for the apparent large molecular size of humic substances, the former becoming more important with the increase of pH. Such novel description of humic substances structure better accounts for their essential role in providing and maintaining soil physical and chemical quality and their reactivity towards pesticides and other environmental soil contaminants. This innovative understanding of the nature of humic substances implies a further development of the science and technology for the control of the chemistry and dynamics of natural organic matter in the soil and the environment." @default.
- W1566631867 created "2016-06-24" @default.
- W1566631867 creator A5066790773 @default.
- W1566631867 date "2002-01-01" @default.
- W1566631867 modified "2023-10-11" @default.
- W1566631867 title "The supramolecular structure of humic substances: A novel understanding of humus chemistry and implications in soil science" @default.
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