动态顶空-气相色谱质谱法测定家用搅拌机中苯系物迁移量

Determination of BTEXs Migration Amount in Food Blender by Dynamic Headspace GC-MS

基于动态顶空-气相色谱质谱技术,建立了家用搅拌机中7种苯系物迁移量的测定方法。采用0.8 L（10%）乙醇模拟液在搅拌机正常工作下进行迁移,以动态顶空吹扫捕集进样、气相色谱-质谱联用检测、外标法定量。该方法对7种苯系物的定量限（LOQ）为0.2-0.4μg/L,具有较高的灵敏度,在0.2-20.0μg/L浓度范围内线性关系良好（其中苯的线性浓度范围为0.4-20.0μg/L,7种苯系物的R^2≥0.995 6）。低、中、高3个添加浓度水平的平均回收率在76.7%-123.3%之间,相对标准偏差（RSD,n=6）在2.2%-14.1%之间。最后,将此方法应用于9款实际搅拌机样品的测定。该方法操作简单、快速、环保、灵敏度高,可用于家用搅拌机中苯系物的迁移量检测。

A method was developed for the determination of BTEXs migration amount in food blender by dynamic headspace autosampler（DHS-GC-MS）.0. 8 L food simulants were added to blender and the migration process was studied under the normal operation,then the migration analytes were determined by DHS-GC-MS and quantified by external standard method. The limits of quantification（LOQ） of the method established were 0. 2 - 0. 4 μg/L for analytes.The linear ranges with good correlation coefficient（R^2≥0. 995 6） were obtained as 0. 4-20. 0 μg/L for benzene and 0. 2-20. 0 μg/L for other analytes.Moreover,the average recoveries of analytes at three added levels ranged from 76. 7% to 123. 3% with RSD（n = 6） varied from 2. 2% to 14. 1% in food simulants.Finally,the method was applied to test nine commercial blenders.In conclusion,the method is simple,rapid,sensitive,environmentally-friendly and suitable for the analysis of BTEXs migration amount in blender.