Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525438
Title Over de systematische veranderingen in uitwisselings-capaciteit van klei
Author(s) Baer, A.L.S.
Source University. Promotor(en): J. Hudig. - Wageningen : Veenman - 148
Publication type Dissertation, internally prepared
Publication year 1936
Keyword(s) kleimineralen - clay minerals
Categories Soil Physics
Abstract Clay particles in suspension are surrounded by an electrical double layer, whose inner layer consists of OH -. There is a linear relation between the amount of OH -in this inner coat and the pH of the equilibrium solution. Consequently the charge on clay particles is a function of the pH of the equilibrium solution.
The degree of flocculation depends mainly on the electrokinetic potential of the clay particles. Therefore differences in flocculation with several salts are closely related to valency and polarizability of the ions.

Calculations from measurements of the capacity of the electrical double layer suggested a specific surface area of 500 m 2per g of bentonite.

Cation exchange does not occur only on clay minerals containing AI in tetravalent positions as it was earlier suggested. Ground kaolinite and halloysite, neither of which contains tetravalent AI, have a considerable cation-exchange capacity. Anion exchange rarely occurs on clays. This follows from the fact that after breaking such a layer as Al 2 (OH) 6 of a clay mineral, there are usually no Al ions in the equilibrium solution to form a double layer with Al as inner coat.
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