以涂敷硝酸银的碱性氧化铝为分散剂的基质固相分散法测定大蒜中二甲戊灵残留

    A Matrix Solid-phase Dispersion Method Using AgNO3-loaded Basic Alumina as Solid-phase for Determination of Pendimethalin in Garlic

    • 摘要: 建立了以涂敷AgNO3的碱性氧化铝为分散剂的基质固相分散(MSPD)法提取、气相色谱/电子捕获检测器检测的大蒜中痕量二甲戊灵的分析方法。通过研究洗脱剂的极性和用量、固相分散剂的含水量和AgNO3涂敷量对回收率及净化效果的影响,优化了MSPD条件。对建立的分析方法进行了评价,结果表明:MSPD提取液的基质效应可以忽略;在0.01、0.10、1.00 mg/kg 3种添加水平下,方法的回收率为84% ~93%,相对标准偏差为2.7% ~6.2%,方法的检出限(S/N=3)和定量限(S/N=10)分别为2.0和6.7 μg/kg。

       

      Abstract: A new analytical method of matrix solid-phase dispersion (MSPD) using AgNO3-loaded basic alumina as solid-phase, followed by gas chromatography-electron capture detection of trace pendimethalin in garlic was presented. The effects on recovery and cleanup of MSPD conditions (the constituent and volume of eluting solvent, the amounts of water and loaded AgNO3 in MSPD sorbent) were investigated and discussed. The proposed analytical method was evaluated. The results showed that matrix effects were negligible; recoveries of pendimethalin from garlic spiked at 3 levels of 0.01, 0.10, 1.00 mg/kg ranged from 84% to 93% with relative standard deviations of 2.7% ~6.2%; and the limits of detection and quantification of the method were determined to be 2.0 and 6.7 μg/kg on the basis of signal-to-noise ratios of 3 and 10, respectively.

       

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