磁性分散固相萃取-QuEChERS结合气相色谱-串联质谱法检测不同柑橘基质中多种农药残留

基于磁性分散固相萃取(MDSPE)-QuEChERS前处理技术,采用气相色谱-串联质谱法(GC-MS/MS)进行定性定量分析,建立了快速检测宽皮柑橘、甜橙、柠檬、柚子和金桔5种柑橘基质中75种农药残留的方法,优化了石墨化碳黑(GCB)、N-丙基乙二胺(PSA)和磁性纳米粒子(MNPS)用量对不同柑橘中目标分析物回收率的...

Analysis of multiple pesticide residues in different citrus matrices by magnetic dispersive solid phase extraction-QuEChERS combined with gas chromatography-tandem mass spectrometry

In this study, a rapid multi-residue detection method for 75 pesticide residues in 5 citrus, including mandarin, orange, lemon, pummelo and kumquat, was developed. Pesticide residues were extracted from citrus by magnetic dispersive solid phase extraction (MDSPE)-QuEChERS pretreatment and analyzed by gas chromatography-tandem mass spectrometry(GC-MS/MS). Graphitized carbon black (GCB), primary secondary amine (PSA) and magnetic nanoparticles (MNPS) were used as adsorbents in the (MDSPE)-QuEChERS pretreatment. In order to obtain the optimum recovery rate of pesticide analysis, the amounts of the adsorbents were investigated. Under the optimized conditions, a simple, fast, safe, cheap, reproducible, and applicable multi-residue method was established. Acceptable linearity was maintained at the concentration of 0.01 to 0.5 mg/kg, the average recoveries were in the range of 63% to 118%, and the relative standard deviations (RSDs) ranged from 0.30% to 16%. Also, the limits of detection (LODs) ranged from 1 to 7 μg/kg and the limits of quantification (LOQs) were in the range of 10-20 μg/kg.