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采用气相色谱法对Ｓ－甲基杀螟硫磷进行分离与定量，色谱柱为０．６ ｍ × ２ ｍｍ（ｉｄ），内填装５％ＤＳ＋ｃｈｒｏｍｏｓｏｒｂ Ｗ ＨＰ固定相。分离度好，定量准确，本方法的相对标准偏差为７．８％，平均回收率为９９．３％。
S-methyl fenitrothion was separated and quantitated by gas chromatography with a column of 0.6 m × 2 mm (id) and a 5% DS + chromosorb W HP stationary phase packed. The separation is good and the quantity is accurate. The relative standard deviation of this method is 7.8% and the average recovery rate is 99.3%.