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目的建立生菜中高效氯氰菊酯农残分析方法。方法采用乙腈提取生菜中的高效氯氰菊酯,用Agilent弗罗里硅柱、NH2柱和C18柱固相萃取柱分别对样品进行净化,利用毛细管柱气相色谱法作为检测手段,GC-ECD进行定性分析。结果高效氯氰菊酯经过弗罗里硅柱的回收率在91.21%～102.78%,变异系数是0.63%～3.57%,最低检出限为0.001 mg·kg-1。结论高效氯氰菊酯顺式体氯氰菊酯和反式体氯氰菊酯2:3的双峰分离较好,操作简单,灵敏度高,添加回收率理想,可用于生菜中高效氯氰菊酯的残留检测分析。
Objective To establish a method for analysis of pesticide residues of beta-cypermethrin in lettuce. Methods Acetonitrile was used to extract beta-cypermethrin in lettuce. The samples were purified with Agilent Florisil column, NH2 column and C18 column respectively. Qualitative analysis was performed by GC-ECD with capillary gas chromatography. Results The recoveries of beta-cypermethrin over Florisil column ranged from 91.21% to 102.78%. The coefficients of variation were 0.63% ~ 3.57%. The minimum detectable limit was 0.001 mg · kg-1. Conclusion The bimodal separation of beta-cypermethrin and trans-alpha-cypermethrin at 2: 3 level is simple, simple, sensitive, and has good recovery rate. It can be used for the determination of beta-cypermethrin residues in lettuce.