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Two components of chloride anion exclusion volume in montmorillonitic soils
Year:
2009
Authors :
Borisover, Mikhail
;
.
Volume :
347
Co-Authors:
Polubesova, T., Department of Soil and Water Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, P.O. Box 12, Rehovot, 76100, Israel
Borisover, M., Institute of Soil, Water and Environmental Sciences, the Volcani Center, ARO, P.O. Box 6, Bet Dagan, 50250, Israel
Facilitators :
From page:
175
To page:
179
(
Total pages:
5
)
Abstract:
Exclusion of chloride anions from negatively charged surfaces was examined in different soils such as Udic Argiboroll, Typic Haploboroll, and Aquents at different CaCl2 concentrations in solutions. The dominant clay mineral in soils is montmorillonite with Ca2+ as a major exchangeable cation. The effect of a salt concentration on anion exclusion volumes in the studied soils was quantitatively explained by the two-component model. According to this model, one component of the anion exclusion volume depending on the salt concentration in solution was described by the theory of electric double layer. It included water layers on the external surfaces of soil particles having freely extended electric double layers. A second component involved internal anion exclusion volume in soil tactoids (i.e. water in the interlayer space between plates), and its magnitude was considered not dependent on salt concentration. Based on determined chloride exclusion volumes, the number of plates and separation distances in soil tactoids were calculated using the two-component model. In different soils, the number of plates in soil tactoids varied between 2.1 and 6.5, and separation distances ranged from 5 to 25 Ǻ. At the lower salt concentrations the interlayer space of soil tactoids provides a minor contribution to the chloride exclusion volume of studied soils. © 2009 Elsevier B.V. All rights reserved.
Note:
Related Files :
Clay minerals
environmental monitoring
soil
Soils
Surface charge
Tactoid
volumetry
water
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More details
DOI :
10.1016/j.colsurfa.2009.04.002
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30707
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:56
Scientific Publication
Two components of chloride anion exclusion volume in montmorillonitic soils
347
Polubesova, T., Department of Soil and Water Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, P.O. Box 12, Rehovot, 76100, Israel
Borisover, M., Institute of Soil, Water and Environmental Sciences, the Volcani Center, ARO, P.O. Box 6, Bet Dagan, 50250, Israel
Two components of chloride anion exclusion volume in montmorillonitic soils
Exclusion of chloride anions from negatively charged surfaces was examined in different soils such as Udic Argiboroll, Typic Haploboroll, and Aquents at different CaCl2 concentrations in solutions. The dominant clay mineral in soils is montmorillonite with Ca2+ as a major exchangeable cation. The effect of a salt concentration on anion exclusion volumes in the studied soils was quantitatively explained by the two-component model. According to this model, one component of the anion exclusion volume depending on the salt concentration in solution was described by the theory of electric double layer. It included water layers on the external surfaces of soil particles having freely extended electric double layers. A second component involved internal anion exclusion volume in soil tactoids (i.e. water in the interlayer space between plates), and its magnitude was considered not dependent on salt concentration. Based on determined chloride exclusion volumes, the number of plates and separation distances in soil tactoids were calculated using the two-component model. In different soils, the number of plates in soil tactoids varied between 2.1 and 6.5, and separation distances ranged from 5 to 25 Ǻ. At the lower salt concentrations the interlayer space of soil tactoids provides a minor contribution to the chloride exclusion volume of studied soils. © 2009 Elsevier B.V. All rights reserved.
Scientific Publication
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