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Abstract
Sorption of 2,4-D and various phenolic compounds by Bentone 24 (Wyoming bentonite coated with one symmetry of dimethylbenzyl octadecylammonium chloride) is pH dependent where the organic compound will vary in the extent of protolysis. Also, this dependence is effective beyond the pH limits affecting protolysis for some compounds. Maximum sorption appears to occur generally where protolysis is less than 50%. The few observations reported here make this estimate a working guide for further study. Studies using organic-clay coatings of different composition (polarity or electron densities) may have a sorption-pH relationship quite different. The percentage sorbed is different for the clay with the organic coating of amine having both aromatic plus alkyl portions (Bentone 24) than with an alkylamine coating (Bentone 18C). The relative sorption of various phenols is much the same on both organoclays.
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