Detail publikačního výsledku

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

KLUČÁKOVÁ, M.

Originální název

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

Anglický název

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

Druh

Stať ve sborníku v databázi WoS či Scopus

Originální abstrakt

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) HA were 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 spectrophotometry. The results obtained for HA and these fractions are compared and discussed.

Anglický abstrakt

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) HA were 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 spectrophotometry. The results obtained for HA and these fractions are compared and discussed.

Klíčová slova

humic acids, fractionation, characterization, buffers

Klíčová slova v angličtině

humic acids, fractionation, characterization, buffers

Autoři

KLUČÁKOVÁ, M.

Vydáno

25.08.2003

Nakladatel

University of Technology and Agriculture, Bydgoszcz, Poland

Místo

Bydgoszcz

Kniha

Proc. Humic Substances in Ecosystems 5

Svazek

Neuveden

Strany od

18

Strany do

18

Strany počet

1

BibTex

@inproceedings{BUT7817,
  author="Martina {Klučáková}",
  title="Characterization and fractionation of humic acids extracted from South-Moravia lignite",
  booktitle="Proc. Humic Substances in Ecosystems 5",
  year="2003",
  volume="Neuveden",
  pages="18--18",
  publisher="University of Technology and Agriculture, Bydgoszcz, Poland",
  address="Bydgoszcz"
}