为考察不同抽吸模式下，滤嘴类型和长度对卷烟主流烟气中苯及苯系物（甲苯、乙苯、对-二甲苯、间-二甲苯、邻-二甲苯和苯乙烯）截留效率的影响，以不同类型、不同长度滤嘴的9种烤烟型和2种混合型卷烟样品为研究对象，考察了ISO和加拿大深度抽吸（HCI）模式下卷烟主流烟气中苯及苯系物释放量差异，并对不同类型、不同长度滤嘴卷烟主流烟气中苯及苯系物截留率进行了对比分析。结果表明：①HCI模式下卷烟主流烟气中苯及苯系物的释放量明显高于ISO模式；②抽吸模式、滤嘴类型和滤嘴长度对苯及苯系物截留率影响较为明显，而对苯及苯系物的截留影响较小。不同类型滤嘴对苯及苯系物的截留率大小顺序为活性炭复合滤嘴＞丙纤滤嘴＞醋纤滤嘴＞纸质复合滤嘴；不同长度滤嘴对苯及苯系物的过滤效率基本上随长度递增而递增；ISO抽吸模式下滤嘴对苯及苯系物的截留率均比HCI模式下高1倍左右。滤嘴对苯及苯系物的过滤优先顺序均为苯乙烯＞邻-二甲苯＞（≈）对-二甲苯＞间-二甲苯＞乙苯＞甲苯＞苯。%To investigate the influences of filter type and filter length on filtration efficiency of benzene and its homologues (toluene, ethylbenzene, p-xylene, m-xylene, o-xylene and styrene) in mainstream cigarette smoke, nine Virginia type and two blended type cigarettes with different filters and/or different lengths were tested under ISO and Health Canada intense (HCI) smoking regimes. The levels of benzene and its homologues were determined and the filtration efficiencies of these filters were compared. The results showed that: 1) The levels of benzene and its homologues in mainstream cigarette smoke under HCI smoking regime were significant higher than those under ISO. 2) Smoking regime, filter type and filter length affected the filtration efficiency to these smoke analytes. However, their effects on the filtration were slightly different depending on the exact smoke analyte. The filtration efficiencies were in the order of active carbon combined filter>polypropylene fiber filter>cellulose acetate filter>paper-acetate combined filter. The filtration efficiency to benzene and its homologues increased with the increase of filter length. The filtration efficiency under ISO smoking regime was about double that under HCI smoking regime. The benzene and its homologues were filtered by the filters in the order of styrene>o-xylene>(≈)p-xylene >m-xylene>ethylbenzene>toluene>benzene.
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