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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F16%3APU120763" target="_blank" >RIV/00216305:26310/16:PU120763 - isvavai.cz</a>

Result on the web

<a href="http://www.mdpi.com/1420-3049/21/11/1410" target="_blank" >http://www.mdpi.com/1420-3049/21/11/1410</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/molecules21101410" target="_blank" >10.3390/molecules21101410</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/LO1211" target="_blank" >LO1211: Materials Research Centre at FCH BUT- Sustainability and Development</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

MOLECULES

ISSN

1420-3049

e-ISSN

—

Volume of the periodical

21

Issue of the periodical within the volume

1

Country of publishing house

CH - SWITZERLAND

Number of pages

9

Pages from-to

1410-1418

UT code for WoS article

000389918200001

EID of the result in the Scopus database

2-s2.0-84993940033