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KLUČÁKOVÁ, M.
Original Title
Characterization of pH-fractionated humic acids with respect to their dissociation behaviour
Type
journal article in Web of Science
Language
English
Original Abstract
Humic acids were divided into several fractions using buffer solutions as extraction agents with different pH values. Two methods of fractionation were used. The first one was subsequent dissolution of bulk humic acids in buffers adjusted to different pH. The second one was sequential dissolution in buffers with increasing pH values. Experimental data were compared with hypothesis of partial solubility of humic acids in aqueous solutions. Behaviour of humic fractions obtained by sequential dissolution, original bulk sample and residual fractions obtained by subsequent dissolution at pH 10 and 12 agrees with the hypothesis. Results demonstrated that regardless the common mechanism, solubility and dissociation degree of various humic fractions may be very different and can be estimated using parameters of the model based on the proposed mechanism. Presented results suggest that dissolving of solid humic acids in water environment is more complex than conventional solubility behaviour of sparingly soluble solids.
Keywords
Humic acid; Dissociation; Solubility; Polyelectrolyte; Fractionation; Acid–base behaviour
Authors
Released
9. 1. 2016
Publisher
Springer
ISBN
0944-1344
Periodical
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Year of study
23
Number
1
State
Federal Republic of Germany
Pages from
7722
Pages to
7731
Pages count
10
BibTex
@article{BUT120453, author="Martina {Klučáková}", title="Characterization of pH-fractionated humic acids with respect to their dissociation behaviour", journal="ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH", year="2016", volume="23", number="1", pages="7722--7731", doi="10.1007/s11356-015-5932-2", issn="0944-1344" }