卷烟烟气总粒相物pH与酸性成分和碱性成分释放量的相关性

Correlations between TPM pH and acidic/alkaline component releases from mainstream cigarette smoke

为考察卷烟烟气总粒相物溶液pH能否反映烟气的酸碱平衡,以及与烟气中化学指标的相关性,确定了总粒相物溶液pH的检测方法,分析了不同单料烟和市售成品卷烟主流烟气常规化学成分、30种主要酸性成分、40种主要碱性成分和氨的释放量与总粒相物pH的相关性,考察了外加酸碱成分对总粒相物pH的影响。结果表明:(1)在异丙醇水溶液中添加1%(质量百分数)NaCl溶液作为萃取剂,可增加不同样品间总粒相物pH测定结果的差异度,降低测定结果的RSD。(2)主流烟气常规成分、主要酸性成分、主要碱性成分和氨的释放量与总粒相物pH之间的相关性无法在不同单料烟和市售成品卷烟上验证。(3)主流烟气烟碱释放量和酸性成分总释放量的比值、烟碱释放量和羧基单元总释放量的比值、烟碱释放量和氢离子总释放量的比值与总粒相物pH之间相关性显著,且可在不同单料烟与成品卷烟上相互验证。(4)2-呋喃甲酸、甲酸、羟基乙酸和乳酸对烟气氢离子总释放量贡献的比例较高。与其他烟气酸性成分相比,当外加质量相同时,这4种酸性成分对总粒相物pH的影响较大。外加氨水对总粒相物pH的影响超过烟碱。

In order to investigate whether the pH of total particulate matter(TPM)can represent the acid-base balance of mainstream cigarette smoke,and to analyze the correlations between the TPM pH and the chemical components of mainstream cigarette smoke,a method for determining the TPM pH was developed.The correlations between the releases of the routine chemical components,plus 30 main acidic components,40 main alkaline components and ammonia in mainstream smoke and the TPM pH of cigarette samples made of different single grade tobacco leaves and commercial cigarette samples were analyzed.The influences of adding acidic and alkaline components to cigarettes on the TPM p H were investigated.The results showed that:1)Adding 1%(mass fraction)sodium chloride to isopropanol aqueous solution increased the differences of detected values of TPM pH among different samples and reduced the relative standard deviation of the measurement values.2)The correlations between the releases of routine components,the main acidic components,the main alkaline components and ammonia in mainstream smoke and the TPM pH could not be verified on the two types of cigarette samples.3)The ratios of nicotine release to the total release of acidic components,the total release of carboxyl units or the total release of hydrogen ions in mainstream cigarette smoke significantly correlated to the TPM pH,which could be verified on the different cigarette samples of the two types.4)The contributions of 2-furoic acid,formic acid,glycolic acid and lactic acid to the total release of hydrogen ions in mainstream cigarette smoke were relatively higher;compared with the other acidic components in the smoke,the effects of these four acidic components on the TPM pH were greater at the same adding mass.The influence of adding ammonia on the TPM pH was stronger than that of nicotine.