Abstract: The concentrations of atmospheric PAN and PPN were measured by online instrument in Beijing from Aug.15 to Sep.12, 2006, and the correlation and concentration variation of PANs were analyzed. The results show that there was a high concentration of PAN and PPN in urban and rural atmosphere in Beijing. The highest concentrations of PAN and PPN were 11219×10^-12 and 1953×10^-12 L/L respectively at Zhongguancun site and 2505×10^-12 and 413×10^-12 L/L at Yufa site. PAN had a good correlation with PPN, also correlated with O_3. Thermal decomposition of PAN (TDPAN) accounted for 10%-70% of the total PAN (the measured PAN+TDPAN).

Key words: correlation, thermal decomposition, peroxyacetyl nitrate, on-line monitoring

摘要： 采用在线监测仪器，2006年8-9月对北京市中关村地区和大兴区榆垡镇大气中的PAN和PPN体积浓度进行了监测，并对浓度变化的影响因素和相关性进行了分析。结果表明：大气中存在着高浓度的PAN和PPN，中关村大气中PAN和PPN的最高浓度分别达11219×10^-12和1953×10^-12L/L，榆垡为2505×10^-12和413×10^-12L/L；两地PAN与PPN的相关性很好,与臭氧也有一定的相关性；热解损失的PAN浓度（TDPAN）与总PAN(监测到的PAN浓度与热解损失PAN浓度之和)的百分比在10%～70%之间。

关键词: 相关性, 热解, 过氧酰基硝酸酯, 在线监测