Publication detail

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

KLUČÁKOVÁ, M.

Original Title

Type

conference paper

Language

English

Original Abstract

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.

Keywords

humic acids, fractionation, characterization, buffers

Key words in English

lignite, humic acids, solubility, fractionation.

Authors

KLUČÁKOVÁ, M.

RIV year

2003

Released

25. 8. 2003

Publisher

University of Technology and Agriculture, Bydgoszcz, Poland

Location

Bydgoszcz

Pages from

Pages to

Pages count

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"
}