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Fulvic acid fractions from mumie
Proceedings. The 8th Russian-Korean International Symposium on Science and Technology, 2004. KORUS 2004., 2005Fulvic acids (FA) from mumie (shilajit) were fractionated by size exclusion chromatography and characterized by IR, NMR /sup 1/H and mass spectra. The presence of functional groups that are usually responsible for antiradical groups that are usually responsible for antiradical action was indicated.
B.S. Kwon +3 more
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Acid-base properties of aquatic fulvic acid
Analytica Chimica Acta, 1985Abstract The acid-base properties of aquatic fulvic acid, concentrated from the Gota River, were studied by means of potentiometri titrations. The forward and reverse titrations exhibited hysteresis, which decreased as the fulvic acid underwent repeated titration.
N. Paxéus, M. Wedborg
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Protonation reactions of fulvic acids
Journal of Soil Science, 1988SUMMARY The protonation reactions of fulvic acids are described in terms of a model involving a mixture of n monoprotic acids HA, HB, HC … pH titration data were analysed by nonlinear least squares methods, using a model having n ...
J. E. GREGOR, H. K. J. POWELL
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Fulvic acid in broiler growing
Животноводство России, 2021Эксперимент показал, что при выращивании бройлеров эффективно добавлять в питьевую воду фульвокислоту в дозе 2% (концентрация 1 г/л). Это позволило увеличить убойный выход потрошеной тушки, массовую долю грудки и бедра, выход мышц и съедобных частей.
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Acid pyrophosphate extraction of soil fulvic acids
Journal of Soil Science, 1986SUMMARY 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, 1982Fulvic 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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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 +4 more
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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 +4 more
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Chemical Characteristics of Fulvic Acids
Journal AWWA, 1963In 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, 1998The 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. +4 more
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Kinetics of aluminum-fulvic acid complexation in acidic waters
Environmental Science & Technology, 1987A 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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