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建立了快速测定绞股蓝中4种拟除虫菊酯类农药残留量的气相色谱/质谱检测方法。样品采用超临界CO2萃取,Florisil固相萃取小柱净化,GC/MS检测。超临界CO2萃取适宜条件为:压力41.370 MPa、温度40℃、改性剂添加量0.08ml/g、静态萃取时间25min、CO2体积为10 ml。方法回收率在92.18%-110.28%,相对标准偏差为6.33%-10.87%。该方法快速、灵敏、准确,各项技术指标均满足农残检测的要求。
A rapid method for the determination of four pyrethroid pesticide residues in Gynostemma pentaphyllum was established by gas chromatography / mass spectrometry. Samples were extracted with supercritical CO2, Florisil solid phase extraction cartridges, GC / MS. The optimum conditions of supercritical CO2 extraction were: pressure 41.370 MPa, temperature 40 ℃, dosage of modifier 0.08 ml / g, static extraction time 25 min, CO2 volume 10 ml. The recoveries were 92.18% -110.28% with relative standard deviations of 6.33% -10.87%. The method is fast, sensitive and accurate, and all the technical indexes meet the requirements of pesticide residue detection.