Abstract:

【Objective】 A gas chromatographic method was established for determination of eight organophosphorous pesticides residues in mutton and analysis of matrix effects. 【Method】 The residues of organophosphorous pesticides in mutton were extracted by using acetonitrile and then the extracts were cleaned up using primary secondary amine as dispersive-solid-phase extract agent. The internal method of matrix-matched calibration standard was used for quantification. 【Result】 The matrix effect of dichlorvos, malathion and dimethoate was obvious, however, that of other organophosphorous pesticides was not obvious in mutton. The linearity was good in the range of 2.5 and 300 μg?kg-1 and the average recoveries of the organophosphorous pesticides from mutton fortified at 50, 100 and 200 μg?kg-1 were between 70.0% and 103%, with relative standard deviations of less than 20%. The limits of detection were about 0.5-1.9 μg?kg-1 for eight organophosphorous pesticides in mutton. 【Conclusion】 A simple, sensitive and reproducible method was developed and could be used to determine the residues of organophosphorous pesticides in mutton or other animal tissues.

Key words: gas chromatography, organophosphorous pesticides residues, matrix effect, mutton