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Published in Soil Sci Soc Am J 28:318-323 (1964)
© 1964 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Reduction in Salt Content of Solution on Passing Through Thin Films Adjacent to Charged Surfaces1

W. D. Kemper and D. E. L. Maasland2

ABSTRACT

An equation was derived to measure the effect of salt and water diffusion on salt reduction of solutions forced through thin films of water by pressure differentials. Salt concentrations of solutions which had passed through thin films adjacent to charged particles were calculated from the equation and are plotted as a function of pressure differential, ionic mobility, film thicknesses, and cation valences. Experimental evidence showed that salt sieving increases as the pressure forcing solution through the clays increases. Salt sieving generally increases as the pores through which the water flows decrease in size, and is smaller when the soil is saturated with divalent rather than monovalent ions. These observations were in agreement with the theory.

NOTES

1 Contribution from Colorado State University and SWCRD, Agricultural Research Service, USDA. Authorized for publication as Colorado Agr. Exp. Sta. Journal Series No. 888. Portions of this work were supported by funds from Regional Project w-68, Petroleum Research Corporation of Denver, and the National Science Foundation.

2 Soil Scientist, Northern Plains Branch, Agricultural Research Service, USDA, and Associate Professor (Agronomy), Colorado State University; and Graduate Assistant, Agronomy Department, Colorado State University, Fort Collins.

Received for publication October 15, 1963. Accepted for publication February 17, 1964.






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