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Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104661
Title Over de systematische veranderingen in uitwisselings-capaciteit van klei
show extra info.
door A.L.S. Bar
Author(s) Baer, A.L.S.
Publisher Wageningen : Veenman
Publication year 1936
Description 148 p
Notes Proefschrift Wageningen
Tutors Hudig, Prof. Ir. J.
Graduation date 1936-02-12
Dissertation no. 91
Author abstract show 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.

Online full textINTERNET
On paper FORUM ; SPEC.COLL. ; A2096,1936,1
FORUM ; STACKS ; NN08202,91
Keyword(s) (cab) clay minerals
Categories Soil Physics
Publication type PhD thesis
Language Dutch; Flemish
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