HS-GC/MS法测定卷烟烟草原料中VOCs的吸附量

Determination of VOCs adsorbed by tobacco materials for cigarette production with HS-GC/MS

为考察挥发性有机化合物（VOCs）在卷烟烟草原料（叶丝、再造烟叶丝、梗丝）上的吸附特性,建立了测定烟草原料吸附的苯、甲苯、乙苯、苯乙烯、丙酮、丁酮、乙酸乙酯、乙酸正丙酯、乙酸异丙酯和乙酸正丁酯等10种VOCs的顶空-气相色谱-质谱联用（HS-GC/MS）方法;测定了不同烟草原料在不同环境浓度和不同吸附时间下对VOCs的吸附量,并对生产车间调试样品中吸附VOCs的量随放置时间的变化进行了分析。结果表明：1优化的顶空条件为平衡温度90℃、平衡时间40 min。2外标法定量的目标物标准曲线线性良好（R^2〉0.99）,加标回收率为85.6%～102.1%,精密度（RSD）为2.4%～6.4%,检出限和定量限分别为0.01～0.04和0.03～0.13μg/g。3相同条件下再造烟叶丝对VOCs的吸附量最大,叶丝的吸附量最小;在考察的浓度及时间范围内,吸附量基本上随环境中VOCs浓度的升高和吸附时间的延长而增大。4在新生产车间的烟草原料中可检测出微量VOCs,但随着在洁净空气中放置时间的延长VOCs逐渐脱附。

In order to investigate the adsorption characteristics of tobacco materials（cut leaf strip,cutreconstituted tobacco and cut stem） in a cigarette for volatile organic compounds（VOCs）,a headspace-gaschromatography-mass spectrometry（HS-GC/MS） method was developed to determine 10 VOCs（benzene,toluene,ethylbenzene,styrene,acetone,butanone,ethyl acetate,propyl acetate,isopropyl acetate,butyl acetate） adsorbedby these tobacco materials.The amounts of VOCs adsorbed by different tobacco materials at different VOCconcentrations during different adsorption time were determined,and the variations of amount of VOCs adsorbedby the tested samples along with their storage duration in a workshop were analyzed.The results showed that：1）The optimized headspace equilibrium condition was 90 ℃ for 40 min.2） The VOCs were quantified by an externalstandard method with the good linearity（R^2〉0.99） of calibration curves.The recoveries were 85.6%-102.1% withthe relative standard deviations ranged from 2.4% to 6.4%.The limits of detection and quantification for the 10 VOCs were 0.01-0.04 and 0.03-0.13 μg/g,respectively.3） The amount of VOCs adsorbed by cut reconstitutedtobacco was the highest,while that by cut leaf strip was the lowest.Basically,the adsorption amount increasedgradually with the increase of adsorption time and VOC concentrations in the environment.4） Trace amount of several VOCs were detectable in the tobacco samples from newly built workshop,however the adsorbed VOCswere desorbed gradually with the prolongation of storage in clean air.