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KLUČÁKOVÁ, M. KARGEROVÁ, A. NOVÁČKOVÁ, K.
Original Title
Conformational changes in humic acids in aqueous solutions
Type
journal article - other
Language
English
Original Abstract
Conformational changes in humic acids in two different aqueous solutions (NaCl and NaOH) are studied by means of high resolution ultrasound spectrometry. The method is based on the measurement of parameters of ultrasonic waves propagating through the sample. The attenuation describes the decay of the amplitude of the ultrasonic wave with the distance travelled. The velocity is the speed of this wave and is related to the wavelength and the frequency of oscillation of the deformation. It is determined by the density and elasticity of the sample, which is strongly influenced by the molecular arrangement. The minimal velocity of ultrasound was observed at 1 g/dm3 for lignitic humic acids and at 0.5 g d/m3 for IHSS Leonardite standard. The values of compressibility as computed are almost constant up to humic acids content corresponding to the minimum velocity of ultrasound and then decrease with the increase in concentration. This shows that the organisation of particles in diluted and concentrated humic acids sols is different. The decrease in compressibility points to the formation of a more rigid structure, which could lead to the decrease in humic acids binding ability. It was confirmed that the method employed was very sensitive and could be utilised as an indicator of conformational changes in humic acids in solutions with varying concentrations.
Keywords
humic acids – conformation – molecular organisation – ultrasound spectrometry – compressibility
Authors
KLUČÁKOVÁ, M.; KARGEROVÁ, A.; NOVÁČKOVÁ, K.
RIV year
2012
Released
30. 3. 2012
Publisher
Springer
ISBN
0366-6352
Periodical
Chemical Papers
Year of study
66
Number
9
State
Slovak Republic
Pages from
875
Pages to
880
Pages count
6
BibTex
@article{BUT92841, author="KLUČÁKOVÁ, M. and KARGEROVÁ, A. and NOVÁČKOVÁ, K.", title="Conformational changes in humic acids in aqueous solutions", journal="Chemical Papers", year="2012", volume="66", number="9", pages="875--880", issn="0366-6352" }