本研究探討以稍加修飾過之Luke萃取法，自小番茄、青江白菜、包心白菜、敏豆及柑 橘五種疏果中，萃取chlorpyrifos、diazinorx、endosulfan、fenarimol、fenvalerate、folpet、ipro dione、malathion、methamidophos、phosmet及procymidone，再以 gas chromatography/mass spectrometry (GC/MS)進行檢測的多重殘留農藥檢驗方法。十一種農藥在2-50 ng/pL濃度範圍 内之標準曲線均呈線性，其迴歸係數(r)介於diazinon的0_97與procymidone的0_99之間。0*5ppm 添加量之回收試驗結果，除methamidophos受到樣品基質干擾外，其餘十種農藥在五種蔬果 中的回收率在64.6-124,6%之間。變異係數介於(K3-17.6%，平均爲5.3%。最低檢測極限，除 methamidophos外，其餘十種農藥在各類受試作物中估計均可低至0J ppm。由於質譜儀比一 般傳統的GC檢測器具有較高的分子專一性(molecular specificity)，且可同時設定追踪數百種標 的離子(target ions)，因此GC/MS方法實爲一値得政府機關大力開發，用以監測曰常食品中殘 留農藥的檢驗方法。

A multiresidue method using gas chromatography/ mass spectrometry (GC/MS) was evaluated for the determination of several pesticides in fruits and vegetables. The pesticides were extracted using a slightly modified Luke multiresidue procedure, separated by capillary column gas chromatography and detected by mass chromatography with quadrupole mass spectrometer in the electron impact mode. Recovery studies of chlorpyrifos, diazinon, endosulfan, fenarimol, fenvalerate, folpet, iprodione, malathion, methamidophos, phosmet and procymidone were performed at the 0.5 ppm spike level in cherry tomatoes, chin-chian pe-tsai, Chinese cabbage'>, kidney beans and oranges. Recoveries were between 64.6 and 124.6%, with the exception of methamidophos which produced interference due to the constituents of the samples. Coefficients of variation ranged between 0.3 and 17.6%, with an average of 5.3%. The estimated limits of detection of the pesticides (except methamidophos) in the crops were at the 0.1 ppm level. Because the mass spectrometer is capable of achieving higher levels of molecular specificity as compared to the traditional GC detectors and can be programmed to search for several hundred target ions simultaneously, GC/MS may be a promising method for the use of regulatory agencies with which to monitor pesticide residues in daily food products.