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首页> 外文期刊>Journal of AOAC International >High-Throughput Analytical Techniques for Determination of Residues of 653 Multiclass Pesticides and Chemical Pollutants in Tea-Part V: A Comparative Study of the Influence of Tea Hydration on the Efficiency of Pesticide Multiresidue Determination Using Three Sample Preparation Methods and GC/MS/MS
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High-Throughput Analytical Techniques for Determination of Residues of 653 Multiclass Pesticides and Chemical Pollutants in Tea-Part V: A Comparative Study of the Influence of Tea Hydration on the Efficiency of Pesticide Multiresidue Determination Using Three Sample Preparation Methods and GC/MS/MS

机译：测定茶叶中653种多类农药和化学污染物残留的高通量分析技术-第五部分：三种样品制备方法和GC / MS / MS对茶叶水化对农药多残留测定效率影响的比较研究

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This paper describes a comparative study of the influence of three sample preparation techniques (M1: hydration + oscillating extraction + partial extraction solution hexane partitioning cleanup; M2: hydration + oscillating extraction + overall extraction solution SPE cleanup; and M3: pure acetonitrile homogeneous extraction + overall extraction SPE cleanup) on the determination efficiency of 456 pesticide multiresidues in tea. First, it was discovered from the mathematical correlation equation of 329 pesticide recoveries established and log Kow values that the extraction efficiency of hydration method M1 has obvious correlation with pesticide log Kow, making the extraction efficiency of M1 take the shape of an arc trend line with a certain arc hanging down from both ends of polar pesticides and nonpolar pesticides. Second, regarding the M1 method, the interfering matter after co-extraction increased in large quantities, which markedly lowered the S/N of the target pesticides and method sensitivity, leading to an obvious decrease of the method efficiency. The fortification experiment of the uniform limit 0.010 mg/kg proved that with the M1 hydration method there are 23 pesticides with recoveries between 70 and 120% and RSD 20%, accounting for only 5.0%, while with nonhydration method M3 there are 229 pesticides, making up 50%.
机译：本文描述了三种样品制备技术（M1：水合+振荡萃取+部分萃取溶液己烷分配净化; M2：水合+振荡萃取+整体萃取溶液SPE净化; M3：纯乙腈均相萃取+总萃取SPE净化）对茶叶中456种农药残留的测定效率。首先，从建立的329种农药回收率的数学相关方程和log Kow值中发现，水合方法M1的提取效率与农药log Kow有明显的相关性，使M1的提取效率呈弧线趋势曲线，极性农药和非极性农药的两端都垂下一定的弧线。其次，关于M1方法，共萃取后的干扰物大量增加，这显着降低了目标农药的信噪比和方法灵敏度，导致方法效率明显降低。统一限值0.010 mg / kg的强化实验证明，采用M1水合方法时，有23种农药的回收率在70％至120％之间，RSD <20％，仅占5.0％，而采用非水合方法M3时，则有229种农药，占50％。

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