The mechanism of sorption of ethylene dibromide on moist soils

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Abstract
The influence of moisture on the swelling of soils and clays has been studied at low moisture contents. No detectable swelling was found with soils at low moisture contents while the montmorillonites showed discontinuous swelling corresponding to the lattice changes indicated by X‐ray analysis. From the sorption isotherms at different moisture contents it is shown that ethylene dibromide is displaced from sorption by water vapour, three distinct stages being apparent. The surface energy of ethylene dibromide solutions has been measured and the Gibbs sorption equation applied to moist soils. It is suggested that sorption on soils at field capacity is partly due to solution in the soil water and partly to sorption at the water interfaces. The surface areas obtained by the B.E.T. method using nitrogen at 78° k are much smaller than areas obtained from the water isotherms and other methods, the difference being apparently due to dehydration of organic matter during degassing.

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