Results 191 to 200 of about 23,723 (227)

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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Interactions between montmorillonite and fulvic acid

Geoderma, 1976
Abstract The isotherms at 20°C for the adsorption of 14 C-labelled fulvic acid from aqueous solutions by montmorillonite containing different exchangeable cations, have been determined. Below a concentration of 0.45 mg/ml and at near neutral pH, all samples give linear isotherms, the slope of which increases in the order Ba 2+ 2+ 2+ 3+ 3 ...
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Aliphatic structures in peat fulvic acids

Science of The Total Environment, 1987
Abstract Fulvic acids, extracted from strongly humified milled peat, were studied through 13C-NMR measurements and cupric oxide oxidations. The 13C-NMR spectrum shows signals caused by the carboxylic carbons, aromatic or olefinic carbons, acetal carbons, aliphatic alcohol carbons and methylene and methyl carbons.
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