Results 181 to 190 of about 23,723 (227)

Acid pyrophosphate extraction of soil fulvic acids

Journal of Soil Science, 1986
SUMMARY A simple three step method is described for isolation of soil fulvic acids in high yield. The complexing agent H 2 P 2 O 7 2− (at pH 2) is used to release soil‐bound ...
J. E. GREGOR, H. K. J. POWELL
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Fulvic acid: modifier of metal-ion chemistry

Environmental Science & Technology, 1982
Fulvic acid, which is derived from the decay of plants and animals, is being studied for its role in the transport and toxicity of metal ions in soil and water. It is discussed in relation to the origin of humic substances and its interactions with metal ions. Techniques for investigating complexes of fulvic acid and metal ions are presented.
R A, Saar, J H, Weber
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Contribution of fulvic acid to the photochemical formation of Fe(II) in acidic Suwannee River fulvic acid solutions

Chemosphere, 2010
We investigated the contribution of fulvic acid to the photoformation of Fe(II) using aqueous Suwannee River fulvic acid (SRFA) as a surrogate for the humic-like substances (HULIS) found in atmospheric condensed phases. The effects of pH (3.2, 4.1, and 5.0) and wavelength (313, 334, 366, and 405nm) on Fe(II) photoformation were studied using ...
Takemitsu, Arakaki, Kiwamu, Saito, Kouichirou, Okada, Hitomi, Nakajima, Yuya, Hitomi   +4 more
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Chemical Characteristics of Fulvic Acids

Journal AWWA, 1963
In the first article of this series on the nature of organic compounds that cause color in natural waters (BLACK, A. P. & CHRISTMAN, R. F. Characteristics of Colored Surface Waters. Jour. AWWA, 55 :753 [Jun. 1963]), data was presented concerning the physical and chemical properties of colored raw waters. This article discusses experimental evidence
A. P. Black, Russell F. Christman
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Europium binding by fulvic acids

Analytica Chimica Acta, 1998
The binding of Eu to fulvic acid (FA) as a function of pH was determined by Schubert's method and by equilibrium dialysis. Data obtained by both methods showed a strong pH dependence, which was reproduced well by the model used to interpret the data (humic ion-binding model VI).
Lead, J. R., Hamilton-Taylor, John, Peters, A., Reiner, S., Tipping, E.   +4 more
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Kinetics of aluminum-fulvic acid complexation in acidic waters

Environmental Science & Technology, 1987
A fluorescence technique has been used to study the complex formation kinetics of aluminum with a single metal-free fulvic acid isolated from an Adirondack Mountain forest soil. In the pH range of 3.0-4.5, two kinetically distinguishable components of the fulvic acid mixture have been identified, which define two types of average aluminum binding sites.
B J, Plankey, H H, Patterson
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Effects of fulvic acids on goat sperm

Zygote, 2018
SummaryThe effects of adding fulvic acids (FAs) to semen extenders on the quality parameters of frozen–thawed goat buck spermatozoa remain undetermined. Buck semen samples collected from six mature goat bucks once a week were diluted with Tris–egg yolk-based extenders.
Yu, Xiao, Zhengmu, Wu, Min, Wang
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ChemInform Abstract: TOTAL SYNTHESIS OF FULVIC ACID

Chemischer Informationsdienst, 1985
AbstractAuf dem im Formelschema beschriebenen Weg erhält man Fulvinsäure (XII) über die instabilen Verbindungen (VIIa) und (X).
S. KATAYAMA, T. TODOROKI, M. YAMAUCHI, T. WATANABE   +3 more
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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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