Results 151 to 160 of about 3,638 (183)
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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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Binding of Methylmercury Compounds by Humic and Fulvic Acids
Water, Air, & Soil Pollution, 1995Humic and fulvic acids were isolated from Fawn Lake in Ontario and investigated by membrane dialysis for their ability to bind CH3Hg+. By measuring the distribution of methylmercury compounds in and outside of the dialysis membrane, for the first time, binding capacities and conditional stability constants for CH3Hg+ and humic acids could be calculated.
H. Hintelmann +2 more
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Multiphase Chemistry of Ozone on Fulvic Acids Solutions
Environmental Science & Technology, 2008By means of a wetted-wall flow tube, we studied the multiphase chemistry of ozone on aqueous solutions containing fulvic acids (FA), taken as proxies for atmospheric "humic like substances", so-called HULIS. In these experiments, the loss of gaseous O3 was monitored by UV-visible absorption spectroscopy at the reactor outlet (i.e., after contact ...
Brigante, M. +3 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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Cloud-point preconcentration of fulvic and humic acids
Talanta, 1999The cloud-point extraction technique was used for preconcentration of fulvic and humic acids. The effect of the acidity of solution, the equilibration temperature and time, the amount of added surfactant (Triton X-100) and the time of centrifugation on the recovery were examined.
R L, Revia, G A, Makharadze
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FT-IR Spectra of Soil Constituents: Fulvic Acid and Fulvic Acid Complex with Ferric Ions
Applied Spectroscopy, 1987FT-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 CH 2
D. Michael Byler +3 more
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Science of The Total Environment, 1991
Abstract The interaction of a well characterized aquatic fulvic acid, Bersbo FA, with Eu 3+ has been studied using ion-exchange distribution studies and an ultrafiltration method. The results indicate that values of overall stability constants, Q MFA , obtained in the ion-exchange distribution studies (log Q MFA = 6.00–8.55), which increased ...
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Abstract The interaction of a well characterized aquatic fulvic acid, Bersbo FA, with Eu 3+ has been studied using ion-exchange distribution studies and an ultrafiltration method. The results indicate that values of overall stability constants, Q MFA , obtained in the ion-exchange distribution studies (log Q MFA = 6.00–8.55), which increased ...
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CHARACTERISTICS OF WATER-SOLUBLE FULVIC ACID-COPPER AND FULVIC ACID-IRON COMPLEXES
Soil Science, 1982M. SCHNITZER, KUNAL GHOSH
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Microbial use of podzol Bh fulvic acids
Canadian Journal of Microbiology, 1969A 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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