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Effect of Various Physical Treatments on Certain Organochlorine Hydrocarbon Insecticides Found in Milk Fat¹

Department of Dairy Science, The Pennsylvania State University, University Park

ABSTRACT

Series of experiments were carried out to determine whether heat, deodorization, steam deodorization, and freeze-drying contributed to a reduction or caused the elimination of heptachlor epoxide and dieldrin from butteroil. Freeze-drying and mild deodorization treatments were not effective. More severe deodorization reduced the insecticide levels significantly; as did heating at very high temperatures. Steam deodorization at 180–195 C and 0.01–0.5 mm Hg for five hours completely removed these organochlorine insecticide residues.

¹ Authorized for publication on September 1, 1967, as Paper no. 3291 in the Journal Series of the Pennsylvania Agricultural Experiment Station.