连续流动法测定卷烟主流烟气中氰化氢的影响因素及方法改进

Influencing Factors in and Improvement of Determination of Hydrogen Cyanide in Mainstream Cigarette Smoke by Autoanalyzer

为了使连续流动法更准确地测定卷烟主流烟气中的氰化氢（HCN）,考察了甲醛、乙醛、丙酮、丙烯醛对连续流动法测定体系的影响,并考察了不同浓度的甲醛对测定体系的影响,以及稀释与不稀释卷烟烟气气相捕集液及粒相萃取液中HCN的稳定性。结果表明：①甲醛对连续流动法测定体系影响最大,乙醛、丙酮及丙烯醛影响较小,可以忽略;②当甲醛含量在5.80μg/mL时,HCN测定值降低7.38%,当甲醛含量在11.49μg/mL时,HCN测定值降低13.51%;③甲醛对样品的稳定性影响最大,乙醛、丙酮及丙烯醛影响较小,可以忽略;④不稀释卷烟主流烟气气相捕集液及粒相萃取液中的HCN稳定性差,稀释卷烟烟气气相捕集液及粒相萃取液的稳定性明显改善;⑤方法的回收率在100%~104%之间,相对标准偏差1.11%。该法与离子色谱法的HCN检测值的相对偏差〈5%。

In order to determine hydrogen cyanide（HCN） in mainstream cigarette smoke with autoanalyzer more accurately,the effects of formaldehyde,acetaldehyde,acetone and acrolein,as well as the concentration of formaldehyde on the determination system were examined,and the stability of HCN in diluted and undiluted trapping solution for gas phase and extraction solution of particulate phase was investigated.The results showed that： 1） formaldehyde had notable influence,however,acetaldehyde,acetone and acrolein had little,negligible influence on the determination system;2） the determined value of hydrogen cyanide decreased by 7.38% and 13.51% in the presence of formaldehyde of 5.80 and 11.49 μg/mL,respectively;3） formaldehyde had notable influence on the stability of the sample,and the other three compounds＇ influence was negligible;4） the stability of HCN in undiluted trapping solution for gas phase and extract solution of particulate phase was poor,which was obviously improved in diluted solutions;5） the recovery of the method ranged from 100% to 104% with the relative standard deviation（RSD） of 1.11%,and the relative deviation between the HCN values by this method and ion chromatography was less than 5%.