Physicochemical characterization of potential colloids from agricultural topsoils

A method based on sedimentation and centrifugation steps has been developed to fractionate agricultural topsoils after suspension in water. A high release of potential colloids has been observed with low Ca 2+ concentration under soil solid-to-water weight ratio conditions higher than 1/3. The collo...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2003-04, Vol.217 (1), p.93-99
Main Authors: Séquaris, J.-M., Lewandowski, H.
Format: Article
Language:English
Subjects:
Agricultural topsoils
Colloidal stability
Critical coagulation concentration
Potential colloid
Soil fractionation
Zeta potential
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Summary:A method based on sedimentation and centrifugation steps has been developed to fractionate agricultural topsoils after suspension in water. A high release of potential colloids has been observed with low Ca 2+ concentration under soil solid-to-water weight ratio conditions higher than 1/3. The colloidal stability is characterized in terms of particle size and electrokinetic properties. There is no systematic effect of the colloid phase organic carbon content varying from 2 to 5% on the critical coagulation concentration (CCC) and zeta potential results. Consequently, the observed CCC was tested by the Derjaguin–Landau–Verwey–Overbeeck theory by taking into account physicochemical properties of the colloid phase mineral content.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(02)00563-0