Characterization and fractionation of humic acids extracted from South-Moravia lignite

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F03%3APU37656" target="_blank" >RIV/00216305:26310/03:PU37656 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Characterization and fractionation of humic acids extracted from South-Moravia lignite
Original language description
Lignite is known as a material from which relatively large quantity of humic acids (HA) can be extracted. Since HA are heterogeneous mixtures of substances, the exact determination of their structure is very controversial. HA vary in composition depending on their source, location and method of extraction. In this work, the general characterization of HA isolated from South-Moravia lignite and some fractions extracted thereof with buffer solutions is reported. Two ways of fractionation were used: 1) HAAwere mixed with buffer at the lowest pH value, then the insoluble residue was separated by filtration and (partially) dissolved in buffer with higher pH value. 2) The original isolated HA were individually dissolved in each buffer solution. It was confirmed, that in both cases the solubility of HA increases with pH value. The dependence of dissolved amount on pH can be characterized approximately by exponential function. HA and obtained fractions were analyzed by FT-IR and UV/VIS spectr
Czech name
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Czech description
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Project
<a href="/en/project/GP104%2F02%2FD036" target="_blank" >GP104/02/D036: Complexation processes in system with characteristic content of humic substances</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2003
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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