碳纳米管改进OuEChERS技术应用于气相色谱法检测果蔬中5种农药残留

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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 ，with a correlation coefficient of ⩾ 0.999 0 The detection limit was between 2.25×10-3mg.kg-1 and 1.76×10-2mg⋅kg-1 ， and the spiked recovery rate was 79.3% to 99.5% ； the relative standard deviation is 0.4% to 3.9% .Conclusion： This method has simple sample pretreatment， short analysis time，highaccuracyandsensitivity，and can be used forrapid and accurate detection offive pesticide residues in fruits and vegetables，providing reliable technical supportfor ensuring the qualityand safetyofagricultural products.

Keywords： QuEChERS; multi-walled carbon nanotubes; pesticide residues

分析检测

农药残留分析是一种在复杂基质混合物中提取并定量分析痕量化合物的技术，样品前处理作为农药残留分析中的关键步骤，对灵敏度、可靠性、分析速度、选择性具有直接影响，是当前该领域的重要研究方向之一[。（剩余5400字）