Determining ten synthetic pyrethroids in lettuce and ground meat by using ion-trap mass spectrometry and electron-capture gas chromatography

Conventional extraction procedures with acetonitrile were compared with supercritical fluid extraction (SFE) with CO2 for determining 10 pyrethroids in fortified lettuce and meat samples. Because SFE utilized a minimal cleanup procedure, nonvolatiles may accumulate on the capillary column in both the gas chromatography-ion trap mass spectrometry (GC-ITMS) and electron capture (EC) detection modes shortening the lifetime of the columns after multiple injections. The GC-ITMS method proved satisfactory for analysis of lettuce whereas EC-GC proved more suitable for residue analysis of meat samples. Improvements in multiresidue methods for monitoring of synthetic pyrethroids in raw agricultural commodities should aid in registration and reregistration activities.