气相色谱-质谱联用检测进出口水产品中氟乐灵残留

采用液液萃取的前处理方式，以气相色谱-质谱联用仪(gas chromatography- mass spectrometry，GC-MS)检测水产品中氟乐灵的残留量。水产品经过匀质，丙酮提取，正己烷进行液液分配，弗罗里硅土柱净化后，用气相色谱-质谱联用仪进行测定和确认，外标法定量。该方法在5～100μg/L质量浓度范围内，相关系数R2为0.99996，具有良好的线性关系，检测限均为1.0μg/kg。分别在鳗鱼、梭子蟹、黄花鱼、印度虾和蛤蜊5种水产品中添加1～4μg/L氟乐灵，回收率在82.0%～93.6%之间。该方法操作简单、灵敏度高，可以满足水产品中氟乐灵的定性定量检测要求。

Determination of Trifluralin Residues in Imported and Exported Aquatic Products by Gas Chromatography-Mass Spectrometry

A gas chromatography-mass spectrometry (GC-MS) method is presented for determining trifluralin residues in aquatic products in this paper. In the method, extraction with acetone, partition with n-hexane and cleanup on a Florisil solid-phase extraction column were used for sample preparation, and quantification was performed by the external standard method. Trifluralin concentration exhibited a good linearity over the range of 5－100μg/L, with a correlation coefficient of 0.99996. The detection limit of this method was 1.0μg/kg for trifluralin. The recovery rates of trifluralin in eel, corvine, India shrimp, clams and swimming crab across the spike levels of 1.0, 2.0μg/kg and 4.0μg/kg were 82.0%－93.6%. This simple and sensitive method can be applied for the determination of trifluralin residues in aquatic products.