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A new method to estimate adsorption energies between cations and soil particles via Wien effect measurements in dilute suspensions and an approximate conductivity-activity analogy
Year:
2005
Authors :
Friedman, Samuel
;
.
Volume :
39
Co-Authors:
Chengbao, L., Institute of Soil Science, Chinese Academy of Sciences, Post Office Box 821, Nanjing 210008, China
Anzhen, Z., Institute of Soil Science, Chinese Academy of Sciences, Post Office Box 821, Nanjing 210008, China
Friedman, S.P., Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
6757
To page:
6764
(
Total pages:
8
)
Abstract:
Measurement of the Wien effect (increased electrical conductivity at strong electrical fields) in soil suspensions is proposed as the basis of a new method to characterize energy relationships between cations and soil particles. The simplified theory behind the method, the working principle of the short high-voltage pulse apparatus, and the measuring procedure are outlined briefly. The new method was used to evaluate the adsorption energies of two monovalent (Na, K) and two divalent (Ca, Cd) cations on yellow-brown soil and black soil particles, assuming an analogy between the activity of the cations and their contribution to the electrical conductivity of the suspension. Both the mean free bonding energies, ΔGbo, and the adsorption energies, ΔGad, of the cations for these two soils increased in the order: Na < K < Ca < Cd. Under the conditions of our experiments, estimated ΔGbo ranged from 4.7 to 6.4 kJ mol-1 and from 7.0 to 8.2 kJ mol-1 for mono- and divalent cations, respectively. The bonding energies obtained with the new method were similar to those determined previously by ionic activity measurement. The determined mean adsorption energies of cations desorbed at a field strength of 100 kV cm -1, for example, ranged from 0.7 to 1.2 kJ mol-1 and from 1.9 to 2.3 kJ mol-1 for mono- and divalent cations, respectively. © 2005 American Chemical Society.
Note:
Related Files :
Adsorption
Adsorption energies
chemical binding
dilution
electric conductivity
Energy relationships
ion transport
soil
Soils
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Related Content
More details
DOI :
10.1021/es050070b
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30557
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:55
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Scientific Publication
A new method to estimate adsorption energies between cations and soil particles via Wien effect measurements in dilute suspensions and an approximate conductivity-activity analogy
39
Chengbao, L., Institute of Soil Science, Chinese Academy of Sciences, Post Office Box 821, Nanjing 210008, China
Anzhen, Z., Institute of Soil Science, Chinese Academy of Sciences, Post Office Box 821, Nanjing 210008, China
Friedman, S.P., Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
A new method to estimate adsorption energies between cations and soil particles via Wien effect measurements in dilute suspensions and an approximate conductivity-activity analogy
Measurement of the Wien effect (increased electrical conductivity at strong electrical fields) in soil suspensions is proposed as the basis of a new method to characterize energy relationships between cations and soil particles. The simplified theory behind the method, the working principle of the short high-voltage pulse apparatus, and the measuring procedure are outlined briefly. The new method was used to evaluate the adsorption energies of two monovalent (Na, K) and two divalent (Ca, Cd) cations on yellow-brown soil and black soil particles, assuming an analogy between the activity of the cations and their contribution to the electrical conductivity of the suspension. Both the mean free bonding energies, ΔGbo, and the adsorption energies, ΔGad, of the cations for these two soils increased in the order: Na < K < Ca < Cd. Under the conditions of our experiments, estimated ΔGbo ranged from 4.7 to 6.4 kJ mol-1 and from 7.0 to 8.2 kJ mol-1 for mono- and divalent cations, respectively. The bonding energies obtained with the new method were similar to those determined previously by ionic activity measurement. The determined mean adsorption energies of cations desorbed at a field strength of 100 kV cm -1, for example, ranged from 0.7 to 1.2 kJ mol-1 and from 1.9 to 2.3 kJ mol-1 for mono- and divalent cations, respectively. © 2005 American Chemical Society.
Scientific Publication
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