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A proposed tentative method for detection of residues of pentachlorophenol and 2,3,4,6-tetrachlorophenol in fats, oils, and commercial food grade fatty acids consists of treating a 5.0 g sample with concentrated sulfuric acid and Celite, followed by a series of liquid-liquid extractions with petroleum ether, aqueous alkali, and chloroform. The residue from the final extract, after further treatment with concentrated sulfuric acid, is analyzed by electron capture GLC. Recoveries of the 2 volatile polychlorophenols were low and varied over a wide range; however, the tentative procedure appears to be satisfactory for qualitative detection at the 0.5 ppm level. Several samples of commercial oleic acids contaminated with chick edema factors were analyzed and were found to be contaminated with pentachlorophenol. Further study of the method is recommended.

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