电纺纳米纤维固相微萃取及农残检测应用

Electrospun Nanofiber Based Solid-Phase Microextraction and Pesticides Determination

利用静电纺丝技术制备了聚苯乙烯/氧化石墨烯（PS/GO）纳米纤维固相微萃取（SPME）涂层,分别研究了GO浓度对纳米纤维形貌的影响以及解吸温度、GO浓度和涂层厚度等参数对萃取性能的影响,比较了PS/GO纳米纤维、PS/GO薄膜及聚二甲基硅氧烷（PDMS）薄膜的萃取性能。将PS/GO纳米纤维SPME与离子迁移谱（IMS）联用,实现了毒死蜱和辛硫磷农药标准品及其混合样品的检测。当萃取时间为3 min时,毒死蜱标准品理论检出限为0.13μg/kg,线性范围为6.25-100μg/kg,相关系数为0.999 0,相对标准偏差（RSD）小于14.0%;辛硫磷标准品理论检出限为0.33μg/kg,线性范围为12.50-100μg/kg,相关系数为0.999 8,RDS偏差小于9.2%。

The electrospun polystyrene/graphene oxide（PS/GO）nanofiber coating for the solidphase microextraction（SPME）was fabricated with the electrospinning technology.Effects of GO concentration on the nanofiber morphology and effects of parameters,such as the desorption temperature,GO concentration and coating thickness,on the extraction performance were investigated,respectively.Besides,the extraction performances among the PS/GO nanofiber,PS/GO film and polydimethylsiloxane（PDMS）film were compared.Organophosphorous pesticide standard samples of chlorpyrifos and phoxime and the mixture sample were detected by the combination of the PS/GO nanofiber SPME with the ion mobility spectrometer（IMS）.When the extraction time is 3 min,the theory detection limit of 0.13μg/kg,the linear range of 6.25-100μg/kg,the correlation coefficient of 0.999 0 and the relative standard deviation（RSD）below14.0%were obtained for chlorpyrifos standard samples.While the theory detection limit of 0.33μg/kg,the linear range of 12.50-100μg/kg,the correlation coefficient of 0.999 8 and the RSD below9.2% were obtained for phoxime standard samples.