气相色谱法测定水产品中的氟乐灵

摘要

建立水产品中氟乐灵残留量的气相色谱检测方法。水产品均质后，用丙酮提取，经正己烷液液萃取，弗罗里硅土固相萃取柱净化后，用气相色谱仪进行测定，外标法定量。该方法在0.5～100ng/mL质量浓度范围内，线性良好，定量限为1.0ng/g。分别在鳗鲡、三疣梭子蟹、文蛤、中国对虾和鲫鱼5种水产品中添加1～10ng/g氟乐灵，回收率在74.8%～99.7%之间。该方法操作简单、灵敏、准确，可以满足水产品中氟乐灵检测要求。%A gas chromatography (GC) method was established for determining trifluralin residues in aquatic products in this study. The sample preparation procedure involved homogenization, acetone extraction, n-hexane partition (liquid-liquid extraction) and cleanup on a Florisil solid-phase extraction column before GC analysis. The quantification was performed by external standard method. The GC method showed good linear relationship over the concentration range of 0.5–100 ng/mL. The limit of quantification was 1.0 ng/g. The recovery rates of trifluralin from eel, crab, clams, crucian and shrimp when spiked at 1.0, 2.0 ng/g and 10.0 ng/g were 74.8%–99.7%, respectively. This method was simple, sensitive and accurate, and therefore could meet the requirements for the determination of trifluralin residues in aquatic products.