SummaryOrganochlorine pesticide residues have been extracted from samples of animal feed by a solid phase extraction clean-up procedure using an octadecyl-bonded column. The proposed method gave recoveries ranging from 70 to 100 YO for ppb levels of the fifteeen pesticides studied. Analytes were identified by dual-column capillary gas chromatography employing DB-1 and and conditioned with methanol (5 ml) and acetone -water :1 1, v/v, 5 ml) lust before use N-Alkylbis(trifluoromethy1)phosphine sulphides CS-Cz2, 1 x M were purchased from Lab Seivice (Bologna, Italy) for use as a retention index reference mixture 2.2 Extraction and Clean-up DB-1701 columns in parallel; identities were confirmed by calculation of retention indexes with the cubic spline interpolation method.
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