JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 4:127-131 (1975)
© 1975 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Rate of Chloride and Water Movement in Southern California Soils1

R. J. Tullock, N. T. Coleman and P. F. Pratt2

ABSTRACT

Column experiments in the laboratory showed an increase of 2 to 25% in the relative rate of chloride movement in soils to water when the movement of water was calculated on a total pore-volume basis. The increase was explained as a result of anion exclusion next to the surfaces of negatively charged soil colloids. The relative rate of flow was decreased when the moisture retained by the air dry soils was deleted from the total pore solution. For soils containing sufficient clay to result in a cation exchange capacity greater than 10 meq/100 g, an equation was developed relating the fraction of the pore solution in equilibrium with anions to the cation exchange capacity. Calculated transit times for anion movement from the soil surface to ground waters should include a correction for the volume of exclusion.

Key Words: anion exclusion • cation exchange capacity • anion leaching rates • ground-water quality

NOTES

1 Contribution from the Department of Soil Science and Agricultural Engineering, Univ. of California, Riverside 92502. Financial support from the Kearney Foundation of Soil Science and the National Science Foundation through Grant No. GL-34733X is gratefully acknowledged.

2 Postdoctoral Fellow, former Professor (now deceased), and Professor of Soil Science, respectively, University of California, Riverside.

Received for publication March 20, 1974.




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Copyright © 1975 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.