Detail publikace

The Role of Concentration and Solvent Character in the Molecular Organization of Humic Acids

KLUČÁKOVÁ, M. VĚŽNÍKOVÁ, K.

Originální název

The Role of Concentration and Solvent Character in the Molecular Organization of Humic Acids

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The molecular organization of humic acids in different aqueous solutions was studied over a wide concentration range (0.01–10 g/dm3). Solutions of humic acids were prepared in three different media: NaOH, NaCl, and NaOH neutralized by HCl after dissolution of the humic sample. Potentiometry, conductometry, densitometry, and high resolution ultrasound spectrometry were used in order to investigate conformational changes in the humic systems. The molecular organization of humic acids in the studied systems could be divided into three concentration ranges. The rearrangements were observed at concentrations of ~0.02 g/dm3 and ~1 g/dm3. The first “switch-over point” was connected with changes in the hydration shells of humic particles resulting in changes in their elasticity. The compressibility of water in the hydration shells is less than the compressibility of bulk water. The transfer of hydration water into bulk water increased the total compressibility of the solution, reducing the ultrasonic velocity. The aggregation of humic particles and the formation of rigid structures in systems with concentrations higher than 1 g/dm3 was detected.

Klíčová slova

humic acid; molecular organization; conformation; aggregation; ultrasound spectrometry

Autoři

KLUČÁKOVÁ, M.; VĚŽNÍKOVÁ, K.

Vydáno

21. 10. 2016

Nakladatel

MDPI AG

Místo

Basel, Switzerland

ISSN

1420-3049

Periodikum

MOLECULES

Ročník

21

Číslo

1

Stát

Švýcarská konfederace

Strany od

1410

Strany do

1418

Strany počet

9

URL

http://www.mdpi.com/1420-3049/21/11/1410

Plný text v Digitální knihovně

http://hdl.handle.net/11012/68390

BibTex

@article{BUT129206,
  author="Martina {Klučáková} and Kateřina {Věžníková}",
  title="The Role of Concentration and Solvent Character in the Molecular Organization of Humic Acids",
  journal="MOLECULES",
  year="2016",
  volume="21",
  number="1",
  pages="1410--1418",
  doi="10.3390/molecules21101410",
  issn="1420-3049",
  url="http://www.mdpi.com/1420-3049/21/11/1410"
}