Conductometric study of the dissociation behavior of humic and fulvic acids

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F18%3APU127761" target="_blank" >RIV/00216305:26310/18:PU127761 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.reactfunctpolym.2018.04.017" target="_blank" >http://dx.doi.org/10.1016/j.reactfunctpolym.2018.04.017</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.reactfunctpolym.2018.04.017" target="_blank" >10.1016/j.reactfunctpolym.2018.04.017</a>

Result language

angličtina

Original language name

Conductometric study of the dissociation behavior of humic and fulvic acids

Original language description

The dissociation behavior of humic and fulvic acids was characterized on the basis of conductometric measurements. It was confirmed that dissociation is strongly affected by the content of humic or fulvic acids in aqueous solution. In the case of fulvic acids, the dilution effect connected with the increase of dissociation degree and the values of activity coefficients was the main factor influencing their dissociation ability. In the case of humic acids, their aqueous leachates were used and characterized as the main fractions functioning actively in natural systems. These fractions can be rich in acidic functional groups and the chemical compositions of these fractions change with their contents in the leachates. The amount of the dissolved humic fraction, its chemical character and its dissociation ability can be considered to result from equilibrium between dissolved and undissolved humic substances. A maximum was observed for the dependence of the dissociation degree on the concentration of humic leachates. In less concentrated leachates, less soluble humic particles with weaker functional groups were able to be dissolved. The increase of humic contents in leachates caused smaller amounts of soluble fractions with the weakest functional groups to remain in an undissolved form, which led to an increase in the degree of dissociation up to a maximum. In the case of fulvic acids, the dissociation degree increases with decreasing concentration as a result of the dilution. Two different values of pKa were determined for each humic and fulvic sample. The first was determined for higher concentrations, where pKa values are practically constant. The second was the value extrapolated to infinite dilution.

Czech name

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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

2018

Confidentiality

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

Name of the periodical

REACTIVE & FUNCTIONAL POLYMERS

ISSN

1381-5148

e-ISSN

1873-166X

Volume of the periodical

128

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

5

Pages from-to

24-28

UT code for WoS article

000435061900003

EID of the result in the Scopus database

2-s2.0-85046654765