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Adsorption of Aldicarb By Clays and Soil Organo-Clay Complexes¹

ABSTRACT

Adsorption experiments conducted with S-methyl-¹⁴C-aldicarb resulted in what appeared to be negative adsorption (exclusion) of the toxicant on Ca– and Al– saturated montmorillonite clays. Calculated exclusion volumes indicated that aldicarb did not penetrate the interlamellar region. Aldicarb was excluded from at least the first 16 layers of water on external surfaces of montmorillonite. Positive adsorption occured with Ca– and Al– saturated illite and kaolinite clays. Equilihration of aldicarb solutions with one acid and two calcareous Vertisols, and with the organo-clay complexes isolated from these Vertisols, produced negative adsorption isotherms for the acid and positive adsorption isotherm for calcareous adsorbents.

¹ Contribution from the Texas Agric. Exp. Stn.

² Area Agronomist, Texas Agric. Extension Service, Lubbock, TX 79409; Associate Professor, and Professor, Soil and Crop Sci. Dep., Texas A&M Univ., College Station, TX 77843, respectively.

Received for publication July 21, 1977. Accepted for publication November 11, 1977.