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Degradation of Chlorinated Hydrocarbon Pesticides in Milk and Butteroil by Ultraviolet Energy¹

Department of Food Science and Industries, University of Wisconsin, Madison

ABSTRACT

High-intensity ultraviolet energy produced by a carbon arc lamp will degrade organochlorine insecticides contaminating fluid whole milk or butteroil. Rate of degradation was a function of the film thickness and depth of penetration of the rays when operating conditions were held constant. Degradation of methoxychlor in butteroil was 96% after one exposure; smaller percentages of other insecticides were degraded. The degradation products for methoxychlor were identified and are structurally similar to those reported for DDT. Removal of pesticides from milk and butteroil by ultraviolet light is still unsatisfactory. Apparently, the most satisfactory control measures involve monitoring the contaminants in the rations fed to lactating animals.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.