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Soil Science Society of America Journal Abstract -

The Effect of Clay Minerals and Exchangeable Cations on the Adsorption of Ethylene Dibromide Vapor1


This article in SSSAJ

  1. Vol. 21 No. 6, p. 599-602
    Received: May 27, 1957
    Accepted: June 6, 1957

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  1. J. J. Jurinak2



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.

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