Single-stage clean-up of animal tissue extracts for organochlorine residue analysis

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Abstract

The use of column chromatography in the clean-up of hexane extracts of animal tissues for pesticide analysis is described, using dry, partially deactivated alumina and silica columns to remove fat and other unwanted materials. By limiting the fat loading of the columns, complete elution of organochlorine residues, free of substances interfering in gas chromatographic analysis, is achieved.

Two types of alumina, of different activities, and one type of silica have been tested and the order of elution of fourteen organochlorine residues determined. Alumina, activated at 800° and partially deactivated with 5% by weight of water, was found to be the most efficient. Silica columns were more effective in the separation of pesticides by differential elution.

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