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The purpose of this report is not only to describe a new cleanup device designed especially for butterfat, but also to point out its utility in a rapid and complete method, as presented, for the detection and determination of organochlorine insecticide residues in butterfat.Time may be saved by two slight procedural modifications. Direct transfer of trapping solution with «-hexane rinses to a miniaturized K-D apparatus incorporating a conical 2.5-ml. graduated centrifuge tube, followed by quick evaporation of most of the trapping solvent, efficiently retains the sought butter volatiles directly in this tube. Also, the use of a short, nonresolving column (76) in the MCGC is recommended, thereby employing the entire method as a true screening test for the detection and estimation of organohalides as a group in butterfat. Indeed, employment of this technique may well be the major emphasis this project should receive, as based on a report (74) which pointed out that, in the first nine months of 1962 in California, pesticide residues found in milk products were mostly DDT, DDD, and DDE, while only a few samples showed lindane, toxaphene, or methoxychlor. If toxaphene is indeed

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