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KINETICS OF WATER VAPOR ADSORPTION ON SOILS

Water vapor transport and adsorption may be a significant factor in solution movement through relatively dry fine-textured soils. An experimental procedure capable of monitoring the temporal dependence of the vapor adsorption is presented herein. Results from several experiments conducted on two bentonite samples were collapsed into a coincident set of curves through normalization of the time axis by the sample mass. Additional experiments were also conducted on two fine-textured soils. From the normalized data it was possible to model the kinetic adsorption process by a hyperbolic type function that depends upon the initial adsorption rate and equilibrium water content of the particular soil. Such dependence suggested that mechanisms involved in physical adsorption of water vapor are common to most soils.