Humic acids from coals of the North-Bohemian coal field: I. Preparation and characterisation

Humic acids were prepared from young North-Bohemian brown coals using alkaline extraction, sedimentation/filtration and acidic precipitation; membrane separations were applied to refine some preparatives. Samples were characterised by chemical analyses, molecular mass distribution, E4/ E6 coefficien...

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Bibliographic Details
Published in:Reactive & functional polymers 2001-03, Vol.47 (2), p.101-109
Main Authors: Novák, Jaromı́r, Kozler, Josef, Janoš, Pavel, Čežı́ková, Jiřina, Tokarová, Věnceslava, Madronová, Libuše
Format: Article
Language:English
Subjects:
Amino acids
Applied sciences
Brown coal
Coal preparation
Electron spin resonance spectroscopy
Exact sciences and technology
Extraction
Filtration
Humic acids
Infrared spectroscopy
Lignin and derivatives
Lignite
Natural polymers
Nuclear magnetic resonance spectroscopy
Physicochemistry of polymers
Precipitation (chemical)
Sedimentation
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Summary:Humic acids were prepared from young North-Bohemian brown coals using alkaline extraction, sedimentation/filtration and acidic precipitation; membrane separations were applied to refine some preparatives. Samples were characterised by chemical analyses, molecular mass distribution, E4/ E6 coefficient, IR spectra, 13C-NMR spectra and EPR spectra. The properties of the coal-derived humic acids were compared with the properties of humic acids prepared from chernozem and peat and with the properties of a commercially available humic acid from Fluka.
ISSN:1381-5148
DOI:10.1016/S1381-5148(00)00076-6