云南普洱茶主产区茶叶中农药残留的GC-NCI-MS-SIM分析

目的]建立云南茶叶中有机磷、有机氯、拟除虫菊酯类农药残留量气相色谱-负化学离子源-质谱-选择离子监测(GC-NCIMS-SIM)同时测定的新方法。方法]以有机磷、有机氯、拟除虫菊酯这些含电负性原子的农药为检测对象,建立了云南茶叶中有机磷、有机氯、拟除虫菊酯类农药残留GC-NCI-MS-SIM同时测定的分析方法。结果]在10~200μg/L浓度时,定量离子的峰面积与浓度有很好的相关性,相关系数都在0.999以上,方法加标回收率在70.65%~103.52%,RSD在1.13%~8.94%,方法最低检测限远远低于国家标准和欧盟残留限量标准。应用GC-NCI-MS-SIM方法分析云南茶叶中有机磷、有机氯、拟除虫菊酯这些含电负性原子的农药,在最低检出限、选择性和抗干扰能力等方面均具有明显优势。结论]该方法高效、准确、选择性好、抗干扰能力强,在云南茶叶农药残留分析领域具有较好的发展前景。

Determination of Pesticide Residues in Tea of Main Producing Areas of Yunnan Pu'er Tea by GC-NCI-MS-SIM

Objective]To establish a new method for simultaneous deter mination of organophosphorus,organochlorine and pyrethroid pesticide residues in Yunnan tea by GC-NCI-MS-SIM. Method] Organophosphorus,organochlorine,pyrethroid,and these negatively charged pesticides were tested,Yunnan organophosphate,organochlorine and pyrethroid was established by GC-NCI-MS-SIM analysis method for simultaneous determina-tion of pesticide residues. Result] Between 10 and 200 μg/L,peak area of quantitative ion had a good correlation with concentration.The recov-eries of method were 70.65%to 103.52%with a relative standard deviation ranging from 1.13%to 8.94%.The limit of detection was lower than the limit standards of national and EU.The method was sensitive and selective,compared favorably with other detection methods,when analyzed pesticides have large electron affinity.Conclusion]The method is efficient,accurate,selective and has strong anti-interference ability,it had pref-erable development in pesticides residues.