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Surface Charge Manipulation in Constant Surface Potential Soil Colloids: II. Effect on Solute Transport¹

ABSTRACT

Potassium breakthrough curves from soil columns containing samples collected from an oxic horizon of a Typic Torrox shifted to the right as the sample was treated with increasing levels of P. The shift in the breakthrough curve was significantly related to a lowering of the zero point of charge. The lowering of the zero point of charge was in turn related to levels of applied P. The anion accompanying K also had a marked effect on the position of the breakthrough curve. When the accompanying anion was Cl, S, and P respectively, the K concentration in the effluent attained one-half of influent concentration at 4.25, 5.30, and 8.20 pore volumes.

¹ Journal Series No. 2281 of the Hawaii Agricultural Experiment Station. This work is based on a dissertation submitted by the senior author to the Graduate Division. Univ. of Hawaii.

² Assistant Researcher and Professor, Department of Agronomy and Soil Science, Univ. of Hawaii, Honolulu, Hawaii, 96822

Received for publication April 7, 1978. Accepted for publication July 25, 1978.