采用电子顺磁共振(EPR)自旋捕集法对国内外196种卷烟主流烟气中气相自由基含量进行了分析测定.结果表明:①卷烟主流烟气中气相自由基含量与焦油及烟碱检测值均无明显相关性,分析认为主要原因可能是卷烟配方中各单料烟的气相自由基含量差异较大；②在同等焦油盒标值下,国内烤烟型卷烟主流烟气中气相自由基平均含量远低于其它卷烟,国内外混合型卷烟主流烟气中气相自由基含量基本相近；③主流烟气中NO和气相自由基含量存在显著的线性相关性(R2=0.891).%Free radicals in gas phase of 196 domestic and foreign cigarettes were analyzed by electron paramagnetic resonance (EPR) spectroscopy in conjunction with the spin trapping technique. Results showed that there was no significant correlation between gas-phase free radical levels and tar or nicotine levels in mainstream cigarette smoke, and may mainly due to the vast difference of free radical levels among components of cigarette blending. For cigarettes with nearly the same tar levels, gas-phase free radical levels of domestic Virginia type cigarettes were significantly lower than those of other types of cigarettes, while blended cigarettes from both foreign and domestic were rather similar. A significant linear correlation (R2 = 0.891) was observed between gas-phase free radicals and nitric oxide in mainstream cigarette smoke.
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