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Wien effect determination of adsorption energies between heavy metal ions and soil particles
Year:
2008
Authors :
Friedman, Samuel
;
.
Volume :
72
Co-Authors:
Wang, Y.-J., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Li, C.-B., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Wang, W., College of Resource and Environ. Science, Nanjing Agricultural University, Nanjing11 210095, China
Zhou, D.-M., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Xu, R.-K., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Friedman, S.P., Institute of Soil, Water, and Environ. Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
56
To page:
62
(
Total pages:
7
)
Abstract:
Gibbs mean free adsorption energies between cations and charged soil particles are a measure of physicochemical interactions between ions and soil particles. The distribution of Gibbs free adsorption energies could not be determined experimentally before the development of Wien effect measurements in dilute soil suspensions. In the present study, energy relationships between heavy metal ions and particles of yellow-brown and black soils (an Alfisol and a Mollisol) were inferred from Wien effect measurements in dilute suspensions, in deionized water, of homoionic soil particles (<2 pm) of the two soils saturated with ions of five heavy metals. The results show that the mean Gibbs free binding energies of the heavy metal ions with yellow-brown and black soil particles diminish in the order Pb2+ > Zn2+ ≥ Cu2+ > Cd2+ > Cr3+, where the range of binding energies for yellow-brown soil (5.39-8.54 kJ mol-1) is less than that for black soil (8.39-9.88 kJ mol-1). The electrical field-dependent mean Gibbs free adsorption energies of these heavy metal ions for yellow-brown and black soils descend in the order Cu2+ > Cd2+ > Pb2+ > Zn2+ > Cr3+ and Cu2+ > Zn2+ > Pb2+ > Cd 2+ > Cr3+, respectively. The mean Gibbs free adsorption energies of Cu2+, Zn2+, Cd2+, Pb2+, and Cr3+ at a field strength of 150 kV cm-1, for example, are in the range of 0.5 to 2.1 kJ mol-1 for the two soils. © Soil Science Society of America. All rights reserved.
Note:
Related Files :
Adsorption
Adsorption energies
Gibbs free energy
Heavy metals
measurement method
physicochemical property
soil surveys
Show More
Related Content
More details
DOI :
10.2136/sssaj2007.0131
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29773
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:49
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Scientific Publication
Wien effect determination of adsorption energies between heavy metal ions and soil particles
72
Wang, Y.-J., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Li, C.-B., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Wang, W., College of Resource and Environ. Science, Nanjing Agricultural University, Nanjing11 210095, China
Zhou, D.-M., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Xu, R.-K., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Friedman, S.P., Institute of Soil, Water, and Environ. Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Wien effect determination of adsorption energies between heavy metal ions and soil particles
Gibbs mean free adsorption energies between cations and charged soil particles are a measure of physicochemical interactions between ions and soil particles. The distribution of Gibbs free adsorption energies could not be determined experimentally before the development of Wien effect measurements in dilute soil suspensions. In the present study, energy relationships between heavy metal ions and particles of yellow-brown and black soils (an Alfisol and a Mollisol) were inferred from Wien effect measurements in dilute suspensions, in deionized water, of homoionic soil particles (<2 pm) of the two soils saturated with ions of five heavy metals. The results show that the mean Gibbs free binding energies of the heavy metal ions with yellow-brown and black soil particles diminish in the order Pb2+ > Zn2+ ≥ Cu2+ > Cd2+ > Cr3+, where the range of binding energies for yellow-brown soil (5.39-8.54 kJ mol-1) is less than that for black soil (8.39-9.88 kJ mol-1). The electrical field-dependent mean Gibbs free adsorption energies of these heavy metal ions for yellow-brown and black soils descend in the order Cu2+ > Cd2+ > Pb2+ > Zn2+ > Cr3+ and Cu2+ > Zn2+ > Pb2+ > Cd 2+ > Cr3+, respectively. The mean Gibbs free adsorption energies of Cu2+, Zn2+, Cd2+, Pb2+, and Cr3+ at a field strength of 150 kV cm-1, for example, are in the range of 0.5 to 2.1 kJ mol-1 for the two soils. © Soil Science Society of America. All rights reserved.
Scientific Publication
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