humic acid

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humic acid

[′hyü·mik ′as·əd]
(organic chemistry)
Any of various complex organic acids obtained from humus; insoluble in acids and organic solvents.
References in periodicals archive ?
The titration results indicated a higher acid group content (18 mol/kg db) for the fulvic acid from the 1:5 coal:[H.
The exchangeable and fulvic acid fraction of the metal--organic-complex-bound Cd contents, together, could explain 91.
Several trace elements well correlated with fulvic acids and some of them correlated negatively with humic acids.
Four different HS including two HS from Altteich peatland in Germany, fulvic acids (FAs) from a Finish spruce forest and the synthetic HA-like caffeic acid oxidation product KOP were tested for their influence on the LPS-induced TNF-[alpha] production in human U937 cells.
Francioso O: Characterization of feat fulvic acid fractions by means of FT-IR, SERS, and H-1, C-13 NMR Spectroscopy, Appl Spec, 52: 270277, 1998.
Yee MM, Miyajima T, Takisawa N (2009) Study of ionic surfactants binding to humic acid and fulvic acid by potentiometric titration and dynamic light scattering.
Namjesnik-Dejanovic K, Maurice PA, Aiken GR, Cabaniss S, Chin YP, Pullin MJ (2000) Adsorption and fractionation of a muck fulvic acid on kaolinite and goethite at pH 3.
Herkorn N, Permin A, Perminova I, Kovalevskii D, Yudov M, Petrosyan V, Kettrup A (2002) Comparative analysis of partial structures of a peat humic and fulvic acid using one-and two-dimensional nuclear magnetic resonance spectroscopy.
A chemical called fulvic acid caused false positive results in tests measuring DNA content and led to incorrect reports in the literature, she says, adding that the presence of fulvic acid makes it necessary to purify ancient DNA carefully.
Fulvic Acid (CAS 479-66-3) Market Research Report 2013 presents comprehensive data on Fulvic acid markets globally and regionally (Europe, Asia, North America etc.
A large proportion of Cu in soil solution was bound to dissolved organic matter (represented by fulvic acid in WHAM model).