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Clay Dispersion and Hydraulic Conductivity of Clay-Sand Mixtures as Affected by the Addition of Various Anions

Published online by Cambridge University Press:  28 February 2024

H. Frenkel ,
G. J. Levy  and
M. V. Fey
H. Frenkel
Affiliation:
Institute of Soils and Water, ARO, The Volcani Center, Israel
G. J. Levy
Affiliation:
Institute of Soils and Water, ARO, The Volcani Center, Israel
M. V. Fey
Affiliation:
Department of Agronomy, University of Natal, Pietermaritzburg, South Africa
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Abstract

The effect of anions on clay dispersion and the hydraulic conductivity (HC) of clay-sand mixtures has received little attention. This study investigates the effect that adding small amounts of anions has on the dispersivity and HC of reference clays. Mixtures of 3 and 6 g 100 g−1 kaolinite, smectite, and illite with quartz sand were packed in columns. The columns were saturated with Ca and then leached with 1 molc m−3 of one of the following organic and inorganic Na salts: chloride, hydroxide, EDTA, silicate, citrate, formate, oxalate, hexametaphosphate, orthophosphate, tartrate, or humate. Changes in HC and clay concentration in the effluent were measured and clay dispersion was evaluated as a function of the various anions added. In the kaolinite clay-sand mixtures, a significant amount of clay was observed in the effluent for all anions tested, and the HC increased above its original value. The HC of smectite clay-sand mixtures decreased following the addition of the various anions. Dispersed clay appeared in the effluent only upon addition of citrate or hexametaphosphate. In the latter two cases, the HC started to increase once maximum clay concentration appeared in the effluent. Clay concentration in the effluent of smectite was one order of magnitude lower than that of kaolinite. Illite clay-sand mixtures showed dispersion behavior intermediate between smectite and kaolinite but behaved in the same way as kaolinite with respect to HC changes.

Keywords

IlliteKaoliniteOrganic anionsSmectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 5 , October 1992 , pp. 515 - 521
Copyright
Copyright © 1992, The Clay Minerals Society

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Footnotes

Contribution from the Department of Agronomy, University of Natal, P.O. Box 375, Pietermaritzburg, South Africa.

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