Publication result detail
Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of their Behavior in Water Environment
KLUČÁKOVÁ, M.
Original Title
Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of their Behavior in Water Environment
English Title
Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of their Behavior in Water Environment
Type
WoS Article
Original Abstract
In this work, the dissociation of humic acids is investigated in point of view of their mean activity coefficients. They are determined on the basis of two different concepts: sparingly soluble substance and multi-step mechanism. It was found that the mean activity coefficients are generally higher, if the traditional concept is applied on the data, excepting HA-A sample. Both used concepts provide the mean activity coefficients dependent on the ionic strength, the amount of dissolved humic acids and the types of electrolyte added in the studied suspensions. Their values based on the concept of multi-step mechanism and determined for humic acids in NaCl and NaI form continuous curve and the individual character of their ions did not assert. It means that activity coefficients were affected only by ionic strength and valence factor of electrolytes irrespective of their chemical composition. The mean activity coefficients obtained for humic acids in HCl are lower in comparison with NaCl and NaI due to the common ion H+. Comparing results obtained for individual humic acids we can state that results obtained for HA-E sample are very different from those of other samples. It seems that its solubility is very high but the majority of dissolved particles remained in the molecular form and only small amount of ions are formed.
English abstract
In this work, the dissociation of humic acids is investigated in point of view of their mean activity coefficients. They are determined on the basis of two different concepts: sparingly soluble substance and multi-step mechanism. It was found that the mean activity coefficients are generally higher, if the traditional concept is applied on the data, excepting HA-A sample. Both used concepts provide the mean activity coefficients dependent on the ionic strength, the amount of dissolved humic acids and the types of electrolyte added in the studied suspensions. Their values based on the concept of multi-step mechanism and determined for humic acids in NaCl and NaI form continuous curve and the individual character of their ions did not assert. It means that activity coefficients were affected only by ionic strength and valence factor of electrolytes irrespective of their chemical composition. The mean activity coefficients obtained for humic acids in HCl are lower in comparison with NaCl and NaI due to the common ion H+. Comparing results obtained for individual humic acids we can state that results obtained for HA-E sample are very different from those of other samples. It seems that its solubility is very high but the majority of dissolved particles remained in the molecular form and only small amount of ions are formed.
Keywords
Activity coefficient; Humic acids; Dissociation; Acidic functional group; Solubility product
Key words in English
Activity coefficient; Humic acids; Dissociation; Acidic functional group; Solubility product
Authors
KLUČÁKOVÁ, M.
RIV year
2021
Released
15.12.2020
Publisher
American Chemical Society
ISBN
2470-1343
Periodical
ACS Omega
Volume
5
Number
49
State
United States of America
Pages from
31518
Pages to
31524
Pages count
7
URL
BibTex
@article{BUT165758,
author="Martina {Klučáková}",
title="Mean Activity Coefficients of Humic Acids as Physicochemical Characteristics of their Behavior in Water
Environment",
journal="ACS Omega",
year="2020",
volume="5",
number="49",
pages="31518--31524",
doi="10.1021/acsomega.0c03311",
issn="2470-1343",
url="https://pubs.acs.org/doi/pdf/10.1021/acsomega.0c03311"
}