复合食品包装袋中二氨基甲苯的气相色谱及气质联用法测定

建立复合食品包装袋中二氨基甲苯的气相色谱和气相色谱-质谱联用测定方法。样品用沸水浸泡，在碱性条件下乙酸乙酯萃取，三氟乙酸酐衍生后用DB-1701石英毛细管柱分离，气相色谱和气质联用检测。二氨基甲苯含量在0.002～0.040mg/L呈现良好的线性关系，相关系数0.9997。本方法的最低检出限为0.001mg/L。在空白的浸泡水样中分别添加0.004mg/L和0.020mg/L两个水平的二氨基甲苯标准溶液，平均回收率为94%，相对标准偏差3.8%～5.5%。方法快速、灵敏、准确，满足复合食品包装袋中二氨基甲苯的日常检验需要。

Determination of 2,4-Diaminotoluene in Laminated Food Packaging Bags by Gas Chromatography and Gas Chromatography-Mass Spectrometry

A gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) method has been established for the determination of 2,4-diaminotoluene in laminated food packaging bags. The samples were soaked by boiling water and the soaked solution was extracted by ethyl acetate. Finally, 2,4-diaminotoluene in ethyl acetate was derived with trifluoro-acetic anhydride and the derivative was separated by DB-1701 capillary column and analyzed by GC and GC-MS. The calibration curve of 2,4-diaminotoluene was linear in the range of 0.002–0.040 mg/L. The limit of detection was 0.001 mg/L. The average recovery rate of 2,4-diaminotoluene at the spiked level of 0.004 mg/L and 0.020 mg/L was 94% with the relative standard deviation of 3.8%–5.5%. The developed method was fast, sensitive and accurate, and was suitable for the determination of 2,4-diaminotoluene in laminated food packaging bags.