Results 191 to 200 of about 21,286 (231)

FT-IR Spectra of Soil Constituents: Fulvic Acid and Fulvic Acid Complex with Ferric Ions

Applied Spectroscopy, 1987
FT-IR spectra and corresponding second-derivative spectra, as well as pertinent difference spectra, of fulvic acid and of fulvic acid complexed with ferric ions have been obtained. The data reveal that the major functional groups present in the fulvic acid studied are carboxyl groupings and CH2 groupings of hydrocarbon chains.
D. Michael Byler, Walter V. Gerasimowicz, Heino Susi, Morris Schnitzer   +3 more
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Adsorption of fulvic acid on goethite

Geochimica et Cosmochimica Acta, 2000
The adsorption of fulvic acid by goethite was determined experimentally as a function of concentration, pH, and ionic strength. The data were described with the CD-MUSIC model of Hiemstra and Van Riemsdijk (1996), which allows the distribution of charge of the bound fulvate molecule over a surface region. Simultaneously, the concentration, pH, and salt
Filius, J.D., Lumsdon, D.G., Meeussen, J.C.L., Hiemstra, T., van Riemsdijk, W.H.   +4 more
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Fulvic acids: structure and metal binding

Journal of Soil Science, 1984
SUMMARY Equilibrium calculations have been carried out at 25°C and an ionic strength of 0.04 to determine the predominant metal binding sites on a well‐characterized fulvic acid for magnesium(ll), calcium(ll), manganese(ll), iron(lll), copper(ll) and zinc(II). Statistical estimates of the concentration of 14 sites
K. MURRAY, P. W. LINDER
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Removing Fulvic Acid by Lime Softening

Journal AWWA, 1985
Lime softening was found to remove a significant fraction of a fulvic acid extracted from groundwater. Removal of the fulvic acid was attributed to coprecipitation and involved its adsorption onto calcium carbonate crystals during the early stages of the softening reaction.
Marcia Yunmen Liao, Stephen J. Randtke
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Microbial use of podzol Bh fulvic acids

Canadian Journal of Microbiology, 1969
A Trichoderma viride, a Penicillium frequentons, and an Aspergillus fumigatus were isolated from fulvic acid enrichment cultures. These and a white rot fungus, Poria subacida 17780, were tested for their ability to decompose fulvic acids (FA) in liquid cultures.
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Pyrolysis of humic and fulvic acids

Geochimica et Cosmochimica Acta, 1969
Abstract Pyrolysis of humic and fulvic acids isolated from a North Carolina soil yields a variety of aromatic, heterocyclic and straight chain organ compounds. The pyrolysis products identified by gas chromatography and mass spectrometry indicate that humic and fulvic acids have aromatic and polysaccharide structures in their molecules.
R.L. Wershaw, G.E. Bohner
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Kinetics of cadmium-fulvic acid complexation

Chemosphere, 1999
Abstract The Cd 2+ -MFA complexation kinetics was described by a series of parallel reactions yielding overall rate as k obs [Cd(H 2 O) 6 2+ ][H 3 L]. Here, k obs is a quadratic function of 1 [ H + ] .
R. Weerasooriya, V. Priyadharshanee
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Fulvic acid and adventitious root formation

Soil Biology and Biochemistry, 1971
Abstract Root initiation was observed in 5-cm hypocotyl segments of beans after treatment with aqueous solutions (pH 6–7) of a soil fulvic acid and plant growth regulators. In most instances the effects were additive; although some synergism was detected with 3-indoleacetic acid and with 1-naphthaleneacetic acid, some results with 2,4 ...
P POAPST, M SCHNITZER
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Fatty acids promote fulvic acid intercalation by montmorillonite

Applied Clay Science, 2014
Abstract Organic matter (OM) adsorbed to the interlamellar surfaces of swelling clay minerals is particularly stable, with residence times as long as 2000 to 10,000 years. Intercalation of OM by smectitic clay minerals may therefore increase the stable C reservoir in both soils and sediments.
William E. Dubbin, Jonathan P. Vetterlein, Jörgen L. Jonsson   +2 more
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Fulvic acid composition in degraded fenlands

Journal of Plant Nutrition and Soil Science, 2001
Fulvic acids (FAs) from topsoil and ground water solutions were investigated to discover effects of land use and peat degradation on their molecular chemical composition and thermal properties. The FAs were extracted from three Gleysols under arable land, intensive and extensive grassland, and from three Histosols under alder forest, extensive ...
Peter Leinweber, Hans-Rolf Schulten, Karsten Kalbitz, Ralph Meißner, Harald Jancke   +4 more
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