Removal of chlorinated pesticide residues in four crude animal and eight crude vegetable oils and fats were studied in manufacturing process.
Results obtained were as follows :
1) Crude vegetable oils were generally less contaminated by chlorinated pesticide residues than crude animal oils.
2) It was recognized that chlorinated pesticides were not reduced in deacidifying and decolorizing process, but remarkable reduction was observed in hydrogenating and deodorizing process, especially in the deodorized oil after hydrogenation, chlorinated pesticides were eliminated almost all.
3) Total DDT was reduced more effectively than total BHC in hydrogenating and deodorizing process.
4) Chlorinated pesticides in animal oils were removed by deodorizing process more effectively than those in vegetable oils were. But no difference in the removal was observed in the case of hydrogenating process.
