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采用衍生气相色谱法测定噁霉灵·络氨铜水剂中噁霉灵在烟草上残留消解动态和最终残留量。样品经丙酮-水(体积比9∶1)超声振荡提取,乙醚萃取,经O,O-二乙基硫代磷酰氯衍生化后,用带火焰光度检测器气相色谱仪进行测定。其结果表明:检出限为0.015mg/kg,定量限为0.049mg/kg,在0.05、0.5、1.0mg/kg添加水平下,添加回收率为83.60%～90.50%,变异系数为5.5%～7.9%。噁霉灵在烟草上半衰期为2.7～3.2d,施药剂量为高剂量1125ga.i./hm2条件下,施药4次,最后1次施药距采收间隔期为21d时,噁霉灵在烟草中的残留量低于0.050mg/kg。
Derivatization gas chromatography was used to determine the dynamics and the final residue of the residual digestion of hymexazol on Nicotiana tabacum. Samples were extracted by sonication with acetone-water (9: 1 by volume) and extracted with ethyl ether. After derivatization with O, O-diethyl thiophosphoryl chloride, the samples were determined by gas chromatograph with flame photometric detector. The results showed that the detection limit was 0.015mg / kg, the limit of quantification was 0.049mg / kg, the recoveries were 83.60% -90.50% at 0.05,0.5,1.0mg / kg, the coefficient of variation was 5.5% 7.9%. Hymexazol on tobacco in the half-life of 2.7 ~ 3.2d, the application dose of high-dose 1125ga.i./hm2 conditions, the application of 4 times, the last one from the harvest interval 21d, Residues in tobacco are less than 0.050 mg / kg.