摘要：A new sampling method by using both a quartz fiber filter (QF) and an activated carbon fiber filter (AF) as a back up filter was developed for gas chromatographic analysis of airborne pesticides, i.e. fenitrothion (MEP), malathion, tetrachlorvinphos (CVMP) and fenobucarb (BPMC). Air was passed at 10 l/min through both a 17.3 cm2 QF and an AF. The both filters sampled were put together and extracted ultrasonically with 3 ml of benzene-ethanol (4 : 1, v/v) for 10 min followed by centrifugation at 2000 rpm for 10 min. The supernatants were analyzed with GC/FPD or GC/FTD. Extraction efficiencies of 5 μg of each pesticide from a QF and an AF were 89.3-107%. Sampling efficiencies of 4 gaseous pesticides with an AF were about 100%. Overall recoveries of 5μg of each pesticide were 90.8-97.6%. Detection limits of MEP, malathion, CVMP and BPMC were 0.6, 1.2, 5.2 and 1.0 ng/m3 respectively for 3.6 m3 of air.
