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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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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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Determination of fulvic acids in water
Journal of Applied Chemistry, 1959AbstractA method for the determination of fulvic acids present in naturally‐occurring waters has been developed, based on the measurement of the ultra‐violet absorption spectrum of the sample. The method has been applied to samples of water from different parts of the country, and the results indicate that for moorland waters the fulvic acids are very ...
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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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Effect of fulvic acid on the photochemical degradation of methylparathion
Journal of Environmental Science and Health, Part B, 2010Photochemical degradation of methylparathion (O,O,-dimethyl O-4 nitrophenylphosphorothioate) in the presence of fulvic acid (FA) between pH 2 and 7 was studied by differential pulse polarography (DPP). Fulvic acid and its photoproducts were not electro-active under the experimental conditions used in this study, and only the pesticide exhibited ...
José A, Manzanilla-Cano +3 more
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Sequestration of biogenic amines by alginic and fulvic acids
Biophysical Chemistry, 2006The interaction of natural (alginic and fulvic acids) and synthetic (polyacrylic acid 2.0 kDa) polyelectrolytes with some protonated polyamines [diamines: ethylendiamine, 1,4-diaminobutane (or putrescine), 1,5-diaminopentane (or cadaverine); triamines: N-(3-aminopropyl)-1,4-diaminobutane (or spermidine), diethylenetriamine; tetramine: N,N'-bis(3 ...
DE STEFANO, Concetta +4 more
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Photooxidation of herbicide amitrole in the presence of fulvic acid
Environmental Science and Pollution Research, 2017Fulvic acid (Henan ChangSheng Corporation) photoinduced degradation of non-UVA-absorbing herbicide amitrole (3-amino-1,2,4-triazole, AMT) as a way for its removal from polluted water was investigated in details. It was shown that the main primary species generated by fulvic acid under UVA radiation, triplet state and hydrated electron, are not directly
Ivan P, Pozdnyakov +7 more
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Effect of fulvic acid on neodymium uptake by goethite
Journal of Colloid and Interface Science, 2012Experimental studies of the interaction of aqueous neodymium (Nd), Suwannee River fulvic acid (FA), and solid phase goethite were conducted. Results from blank systems (individual Nd and FA), binary systems (Nd-goethite, FA-goethite, and Nd-FA), and ternary systems (Nd-FA-goethite) at 0.1 mol/kg and 25°C are reported. In the binary Nd-goethite system a
Christopher R, Armstrong, Scott A, Wood
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Fluorescence quenching of fulvic acids by fullerene in water
Environmental Pollution, 2013Fullerene can be suspended in water as nanoscaled-fullerene-aggregates (nC(60)). However, little is known about its biogeochemical cycling in natural waters. In this paper, the interactions between nC(60) and fulvic acids were investigated using fluorescence spectroscopy and fluorescence quenching titration.
Fengchang, Wu +5 more
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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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