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The Transport of Cations in Soil Columns at Different Pore Velocities¹

ABSTRACT

The transport of Na⁺ and Mg²⁺ in Ca²⁺-saturated Yolo loam soil column under saturated steady state flow of different pore velocities was studied. The cation solution was maintained at a concentration such that a linear adsorption isotherm described the cation adsorption. Experimental retention curves were compared to the theoretical solutions obtained from a linear equilibrium model. At low relative concentrations, the equilibrium adsorption of Na⁺ was significantly less than that of Mg²⁺. At high pore velocities, the agreement of the experimental retention curves with that of the theoretical calculation was good. At low pore velocity, the agreement was poor. The retention volumes of Na⁺ and Mg²⁺ were smaller than those theoretically calculated and those obtained experimentally at high pore velocity. Extensive tailing of Mg²⁺ observed in the experimental data was not described by the theoretical model.

¹ Support of this work by FWQA grant WP-01492-01 is gratefully acknowledged. Published with the approval of the Director, Utah Agr. Exp. Sta. as Journal Paper 1213.

² Former post doctoral fellow and Professor of Soil Chemistry, respectively, Dep. of Soil Sci. and Biometeorology, Utah State Univ., Logan, Utah, 84321. The senior author's present address is: Dep. of Crop and Soil Sci., Michigan State Univ., East Lansing, Michigan 48823.

Received for publication February 25, 1972. Accepted for publication May 11, 1972.