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KLUČÁKOVÁ, M. VĚŽNÍKOVÁ, K.
Original Title
The Role of Concentration and Solvent Character in the Molecular Organization of Humic Acids
Type
journal article in Web of Science
Language
English
Original Abstract
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.
Keywords
humic acid; molecular organization; conformation; aggregation; ultrasound spectrometry
Authors
KLUČÁKOVÁ, M.; VĚŽNÍKOVÁ, K.
Released
21. 10. 2016
Publisher
MDPI AG
Location
Basel, Switzerland
ISBN
1420-3049
Periodical
MOLECULES
Year of study
21
Number
1
State
Swiss Confederation
Pages from
1410
Pages to
1418
Pages count
9
URL
http://www.mdpi.com/1420-3049/21/11/1410
Full text in the Digital Library
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" }