卷烟主流烟气气相水分的捕集及其卡尔·费休法测定

Trap of Moisture in Gas Phase of Mainstream Cigarette Smoke and its Determination with Karl Fischer Titration Method

为了解烟气水分对卷烟吸味的影响,以异丙醇和乙醇作吸收液,采用两级碰撞取样器串联捕集烟气气相物,卡尔.费休法测定了20种国产品牌卷烟样品烟气粒相水分和气相水分。结果表明：①微量水检测限为0.35 mg/mL,回收率〉95%,粒相水分和气相水分的RSDs分别为3.5%和4.5%;②卷烟样品烟气粒相水分和气相水分的含量范围分别为1.33～3.01和3.71～8.89 mg支/。主流烟气气相水分可能是影响卷烟抽吸品质的一个重要指标。

In order to investigate the influence of smoke moisture on cigarette taste,the moisture in gas phase and particulate matter of mainstream cigarette smoke of 20 domestic brand cigarette samples was trapped by a tandem impingement sampler containing the mixture of isopropyl alcohol and ethanol as an absorber,and then determined with Karl Fischer titration method.The results indicated that the limit of detection of micro moisture was 0.35 mg/mL,the recovery was over 95%,and the RSDs of the moisture content in particulate matter and gas phase were 3.5% and 4.5%,respectively.The moisture contents in particulate matter and gas phase ranged from 1.33 to 3.01 mg/cig.and from 3.71 to 8.89 mg/cig.,respectively.It was concluded that the moisture content in gas phase of mainstream smoke might be one of the important factors affecting the smoking quality of cigarette.