recovered from the carbon in that work may have resulted from reactions similar to those reported here.Reactions of chlorine and organic compounds on activated carbon have several environmental implications. The quiñones and polyphenols formed on the carbon surface are of interest since they are toxic to aquatic plants (19) and participate in redox reactions in the environment. Quinones have also been shown to be toxic to blue-green algae (20) and to inhibit the photosynthesis of green algae (21).The columns in these experiments were run for only a short period of time, and many oxidized compounds were found in the inlet to the bed. It would be expected that these compounds could be displaced further into the column during the life of the bed and eventually pass into the effluent. Although outside the scope of the present study, it would be interesting to observe the conditions under which displacement could occur and the concentrations and biological properties of the effluent organic compounds.

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