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Published in Soil Sci Soc Am J 21:599-602 (1957)
© 1957 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Effect of Clay Minerals and Exchangeable Cations on the Adsorption of Ethylene Dibromide Vapor1

J. J. Jurinak2

ABSTRACT

A study was conducted to investigate the effect of clay mineral and exchangeable cation on the adsorption of ethylene dibromide (EDB) vapor by dehydrated clay. The Brunauer, Emmett, and Teller (BET) equation was applied to the data and the BET parameters Wm, n, and C evaluated. Both the exchangeable cation and the clay mineral had a pronounced effect on the adsorption process. Adsorption, in all cases, was confined to the external surfaces of the mineral systems.

The effect of Mg, Ca, and Na ions on the adsorption of EDB by montmorillonite was accredited to the varying amount of moisture retained by the homoionic clay systems after dehydration, the retained moisture being important in determining the extent and nature of the adsorbing surface.

The adsorption of EDB per unit surface by Ca-montmorillonite, -illite, and -kaolinite indicated that adsorption on Ca-montmorillonite is more restricted than on Cakaolinite, with Ca-illite being intermediate. These data and the BET parameters support the view that the effect of clay minerals on EDB adsorption is a manifestation of the physical condition of the clay surface after dehydration. The montmorillonite system presenting a porous aggregate whose capillary dimensions restrict adsorption while the kaolinite system presents a relatively unrestricted planar surface for vapor adsorption.

NOTES

1 Contribution from the Department of Soils and Plant Nutrition, University of California, Davis.

2 Junior Soil Chemist.

Received for publication May 27, 1957. Accepted for publication June 6, 1957.






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Copyright © 1957 by the Soil Science Society of America.