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Published in Soil Sci Soc Am J 37:21-24 (1973)
© 1973 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Chloride Movement in Undisturbed Swelling Clay Soil1

D. E. Kissel, J. T. Ritchie and Earl Burnett2

ABSTRACT

Relatively large, continuous soil pores were important pathways of downward Cl- movement in saturated, swelling clay soils. Using water-soluble fluorescein as a tracer for downward water and Cl- movement in field basins, distinct small areas of the soil contained fluorescein, whereas nearby areas contained no visible fluorescein after Cl- and fluorescein was ponded at the surface for 1.5 days. Chloride contents in the areas containing fluorescein were considerably higher than in nearby areas. Breakthrough curves of a large saturated core of undisturbed swelling clay soil indicated that Cl- was moving quite rapidly through large connected pores. In the undisturbed swelling clay soil, the volume of soil water not containing Cl- was about 60%; when the disturbed soil was repacked to the same density this value decreased to 40%.

More of the original soil solution was eluted from long undisturbed cores than from short undisturbed cores of the same diameter before Cl- appeared in the effluent. Apparently the longer core wall blocked more connected flow paths which were not vertical.

NOTES

1 Contribution from Texas Agr. Exp. Sta., Texas A&M Univ. in cooperation with Soil and Water Conservation Research Division, ARS, USDA.

2 Assistant Professor, Texas Agricultural Experiment Station and Soil Scientists, USDA, Temple, Texas, 76501, respectively.

Received for publication January 13, 1972. Accepted for publication September 18, 1972.






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