humic acid

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Related to Humic substances: humic acid

humic acid

[′hyü·mik ′as·əd]
(organic chemistry)
Any of various complex organic acids obtained from humus; insoluble in acids and organic solvents.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
and Chalupska, K.: 2003, Modeling of metal humate complexation based on the mean molecular weight and charge of humic substances: Application to Eu(III) humate complexes using ion exchange method.
The binding sites for Cu, Cd, and Pb are strongly related to the humic substance content of extracellular polymers (ECP) in activated sludge (Guibaud et al., 2003).
He is also a senior member of the International Humic Substances Society and was chairman of the 900-person group's 2010 meeting in the Canary Islands.
Emerging concepts of the compositions and structures of humic substances. In Humic Substances in Soils, Peats and Waters.
Humic substances are able to bind extracellular enzymes (humic-enzyme complexes) and preserve them from proteolysis and chemical degradation.
Flocculation impaired by the presence of humic substances might be an explanation for low precoat filtration efficiency in biologically pretreated greywater.
Humic substances are reported to help in nitrate uptake from soil and facilitate water use efficiency.
The properties of Humic substances, major constituents of soil organic matter, include chelation, mineralization, buffer effect, clay mineral-organic interaction, and cation exchange.
These soluble organic compounds consist of root exudates, humic substances, metabolites of microorganisms, or applied iron-chelate fertilizers.
leaves, branches, barks, litter, sediments, phytoplankton, DOM, humic substances, sugars, polyphenolic compounds and amino acids; Almazan and Boyd, 1978; Antonio et al., 1999; Borsuk and Stow, 2000; Bitar and Bianchini Jr., 2002; Cunha-Santino et al., 2002, 2008; Cunha-Santino and Bianchini Jr., 2003b, 2004).
Sorption of humic substances onto various minerals and clay media, especially the aluminosilicate clays, has been previously investigated, including montmorillonite (Filip and Alberts 1994; Varadachari et al.