差分光学吸收光谱法研究卷烟主流烟气NO2

Measurement of NO_2 in Cigarette Main Smoke by Differential Optical Absorption Spectroscopy

利用差分光学吸收光谱(DOAS)仪对不同品牌卷烟主流烟气中的NO2进行连续、实时、在线测量,使用RM200型转盘式20孔道吸烟机,一次将20只卷烟顺序输送到吸烟转盘上,间隔3 s依次点火,并将卷烟烟气通入与之直接相连的总光程为31.5 m的怀特池,利用差分光学吸收光谱技术,可在6～7 min之内完成对整只卷烟的逐口测量,提高了测量结果的时间分辨率。抽吸开始时,怀特池气压被抽到5.2×104Pa,所有卷烟完成测量时,气压恢复到1.03×105Pa;抽吸结束后,怀特池中NO2的浓度在0.89 mg/m3和1.54 mg/m3之间。比较不同品牌的卷烟,主流烟气中NO2浓度有明显差别,特别是混和型卷烟比烤烟型高83%,该技术对卷烟烟气成分的快速检测提供了一种简便的方法。

NO2 in cigarette main smoke of different kind brands was measured continuously by differential optical absorption spectroscopy （DOAS）. By using RM200 rotating disk smoking machine with 20 smoking flue, 20 cigarettes were inserted into the rotating disk and ignited every 3 s. By use of DOAS technique, the measurement was completed within 6-7 min after the smoke was transported into a White cell with 31.5 m path length which was connected to the smoking machine. This technique can improve the measuremental temporal resolution compared with traditional method. At the beginning, the press in White cell was 5.2 ×10^4 Pa and it increased to 1.03 × 10^5Pa while the measurement finished. The result shows the concentration of NO2 in main smoke is between 0.89 mg/m^3 and 1.54 mg/m^3 and the concentration of NO2 in main smoke is quite different for different brands cigarette. The NO2 concentration of mixing type cigarette is 83 % high than that of roast type cigarette. This technique provides a simple and quick method for analyzing components of cigarette smoke.