Publication detail

Conformational changes in humic acids in aqueous solutions

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"
}