Results 191 to 200 of about 5,143,384 (251)
Some of the next articles are maybe not open access.
Production of humic and fulvic acids analogs through the ultrasonication of low-rank lignite coals
Reaction Chemistry & Engineering, 2023We present a process utilizing an ultrasonic horn-type reactor for the conversion of lignite-coal into humic and fulvic acids analogs, achieving a 72% yield of humic acids analogs and 92%...
Redhwan Al-Akbari +2 more
semanticscholar +1 more source
Total synthesis of fulvic acid
Journal of the Chemical Society, Chemical Communications, 1984Synthesis of fulvic acid (1a) was accomplished by a route involving selective ozonization of 9-propenylpyranobenzopyran (1c), obtained by a regioselective cyclization of the 2-methylsulphinylmethyl 1,3-dione(3c).
Masashige Yamauchi +3 more
openaire +1 more source
Biological decomposition of fulvic acid preparations
Folia Microbiologica, 1976Decomposition of preparations of various fractions of fulvic acids in pure cultures of bacteria and in the soil was investigated. In the soils enriched with fulvic acids the amount of bacteria increased, oxygen consumption and formation of carbon dioxide followed a typical sigmoid curve.
F, Kunc, R A, Lokhmacheva, J, Macura
openaire +2 more sources
Polarity based fractionation of fulvic acids
Chemosphere, 2009Fulvic acids from the soil of Peking University (PF) and a Nordic river (NF) were separated into well defined sub-fractions using sequential elution techniques based on eluent polarity. The chemical properties of the fractions including: PF1 and NF1 (eluted by 0.01 M HCl), PF2 and NF2 (eluted by 0.01 M HCl+20% methanol), PF3 and NF3 (eluted by 0.01 M ...
Aimin, Li +4 more
openaire +2 more sources
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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.
openaire +1 more source
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
openaire +1 more source
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
openaire +2 more sources