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.
SummaryA simple micro-method is described for determination of 15 organochlorine pesticide residues in mixed feeds. Clean-up of the petroleum ether extract is by basic alumina minicolumn chromatography and quantitative identification is by capillary gas chromatography with electron capture detection. Cyanopropyl-polysiloxane chemically bonded fused silica capillary columns have been used to perform high resolution analyses in short time as well as to overcome possible interferences by PCBs. Recovery, repeatability, and detection limits of the proposed procedure are checked and results are also reported for non random samples of 180 feeds collected in Italy.
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