多环芳烃在卷烟烟丝段的截留行为

Retention behavior of polycyclic aromatic hydrocarbons by tobacco rod of cigarette

为考察主流烟气产生过程中烟丝段对烟气成分的截留作用,建立了烟丝段对烟气多环芳烃截留的分析方法,研究了21种多环芳烃在烟丝段的截留行为。将卷烟去掉滤嘴后在设定条件下抽吸一口,用液氮淬灭燃烧锥,利用全自动卷烟切割仪将剩余烟丝分切成长度为5 mm的小段。采用环己烷萃取、GC-MS/MS法测定各烟丝小段中多环芳烃的截留量,分析了多环芳烃在烟丝段的截留分布特点,考察了抽吸容量、烟丝填充密度和烟支圆周对多环芳烃烟丝截留行为的影响。结果表明:①烟丝段对烟气21种多环芳烃的截留率在25.2%~65.5%之间,其中,19种多环芳烃的截留率在40%以上,表明烟丝段对多环芳烃的截留作用较强;截留率随多环芳烃沸点的升高总体上增大。②烟丝段对多环芳烃的截留主要分布在靠近燃烧锥的25 mm烟丝段,烟丝后段的截留作用较差。③抽吸容量从20 mL增加至70 mL,烟丝段多环芳烃的累积截留率呈降低趋势。④烟丝填充密度从223 mg/cm^(3)增加至281 mg/cm^(3),烟丝段对多环芳烃的累积截留率总体升高。⑤相同烟丝段长度下,24.2 mm圆周卷烟的烟丝段多环芳烃累积截留率高于17.0 mm圆周卷烟。

To investigate the retention behavior of smoke components by tobacco rod of cigarette during smoking,a method for analyzing polycyclic aromatic hydrocarbons(PAHs)retained in tobacco rod was established and the retention behavior of 21 PAHs was studied.Cigarettes with removed filters were smoked for one puff under a defined machine-smoking protocol,followed by quenching of the combustion cone with liquid nitrogen.The remaining tobacco rods were cut transversely into approximately 5 mm long pieces using an automatic cigarette cutter,followed by extraction with cyclohexane.The contents of PAHs retained in these subsections were analyzed by GC-MS/MS and the distributions of PAHs were obtained.The effects of puff volume,tobacco rod density,and cigarette circumference on the retention of PAHs in tobacco rods were investigated.The results showed that:1)The retention rates of 21 PAHs in tobacco rod varied from 25.2%to 65.5%,of which 19 PAHs were retained over 40%,indicating stronger retention of PAHs by tobacco rod.Retention rates increased with increasing boiling points of PAHs.2)The retention of tobacco rod on PAHs was concentrated in the first 25 mm length of tobacco rod subsection adjacent to the combustion cone,while the retention became weaker in the downstream subsection.3)The cumulative retention rates of tobacco rod on the PAHs showed a decreasing trend with increasing puff volume from 20 mL to 70 mL.4)When the tobacco rod density varied from 223 mg/cm^(3)to 281 mg/cm^(3),the overall cumulative retention rates of tobacco rod subsections on PAHs increased.5)The cumulative retention rates of the PAHs for 24.2 mm circumference cigarette were higher than that of 17.0 mm at equal tobacco rod length.