提出了食品包装复合膜中残留的13种有机溶剂(苯类、醇类、酮类、酯类等)的顶空-气相色谱法.分别选择100 ℃及30 min作为样品在顶空瓶中的平衡温度和平衡时间.选用CP-WAX毛细管色谱柱(50 m×0.25 mm,0.2 μm)分离,氢火焰离子检测器测定.13种有机溶剂在25 min内能完全分离.13种有机溶剂的质量浓度在0.086~1.72 mg·m-2范围内呈线性,测定下限(10S/N)在0.003~0.007 mg·m-2之间.方法用于复合膜样品分析,加标回收率在90.5%~98.7%之间,相对标准偏差(n=6)在1.85%~4.86%之间.

Thirteen residual organic solvents,including several benzene homologous,alcohols,ketones and esters,in compound plastic film for food packaging were determined by head-space-GC. The temperature and time chosen for equilibration of the sample in the head-space vessel were 100 ℃ and 30 min respectively. Capillary chromatographic column of CP-WAX (50 m×0.25 mm,0.2 μm) was used for the separation,and hydrogen FID was adopted in the determination. Under the optimum conditions,the 13 organic solvents were separated within 25 min. Linearity ranges of the 13 organic solvents were kept in the same range of 0.086-1.72 mg·m-2,with lower limits of determination (10S/N) in the range of 0.003-0.007 mg·m-2. The proposed method was applied to the analysis of compound plastic film samples,and values of recovery found by standard addition method were ranged from 90.5%-98.7%,with RSD′s (n=6) in the range of 1.85%-4.86%.