Improved QuEChERS Technology Using Carbon Nanotubes for Gas Chromatography Detection of Five Pesticide Residues in Fruits and Vegetables

    ZI Qinjiang'， ZHAO Wenying2，WANG Jin3* (l.Eryuan CountyInspectionand Testing Institute，Eryuan 6712oo， China;

    2.Lijiang Inspection， Examination and Certification Institute，Lijiang 6741Oo， China;

    3.Yunnan Vocational and Technical College of Agriculture， Kunming 65oo31， China)

    Abstract： Objective： To establish a QuEChERS technique based on multi-waled carbon nanotubes and combined with gas chromatography for detecting residues of five pesticides， namely oxytetracycline， methyl parathion，chlorpyrifos，azithromycin，and triazophos，in fruits and vegetables.Method： Multi walled carbon nanotubes were used as solid phase extractant，and the QuEChERS pretreatment technology was improved， including optimizing the extraction method， extraction solvent， eluent， and dosage of multi walled carbon nanotubes. Gas chromatography was used to quantitatively determine five pesticide residues.Result： The five pesticides showed a good linear correlation between 0.01mg^-L^-1 and 0.20mg^-L^-1 ......