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Solubility-Temperature Effect on the Adsorption of Gamma- and Beta-BHC from Aqueous and Hexane Solutions by Soil Materials¹

ABSTRACT

Freundlich adsorption isotherms were obtained for gamma- and beta-isomers of 1,2,3,4,5,6-hexachlorocyclohexane adsorbed from aqueous and hexane solvents on Ca-Staten peaty muck, Ca-bentonite Ca-Venado clay, and silica gel in the temperature range of 10 to 40C. Comparison of normal and "corrected" isotherms revealed a significant effect on adsorption due to the influence of temperature on solubility. The 1/n constants of the Freundlich equation increased with temperature according to the theory of dilute solutions. When the solubility effect is removed, the gamma isomer has greater adsorbability than the beta isomer, possibly because the former possesses a dipole moment whereas the latter does not. At constant solution fugacities, the gamma isomer on Staten peaty muck competed somewhat more effectively with hexane than with water.

¹ Investigation supported by Training Grant 5T-1-WP-07 and Research Grant WP-0008 from the Federal Water Pollution Control Administration and Regional Research W-82.

² Graduate Student and Associate Professor, respectively, Dept. of Water Science & Engineering, Univ. of California, Davis. The senior author's present address is C-52 N.D. South, c/o AFPRO, Extension II, New Delhi 16, India.

Received for publication October 2, 1968. Accepted for publication October 21, 1968.