Wang Bin, Zhang Jian-bo
Department of Environmental Science, Peking University, Beijing 100871, China.
Huan Jing Ke Xue. 2007 Jul;28(7):1621-6.
PAN and PPN in the urban air of Beijing were monitored by using a online instrument from Aug. 15th to Aug. 28th, 2005. The results show that the concentrations of PAN and PPN are extremely high in the air of the city area of Beijing, and the highest concentrations of PAN and PPN during the daytime are 2 493.2 x 10(-12) and 509.2 x 10(-12) respectively. A strong correlation is found between PAN and PPN, R2 = 0.9495, and the average ratio of [PPN]/[PAN] is about 20.2%, which suggests anthropogenic VOCs are dominant when compared to biogenic ones in the urban air. The precipitation has strong negative effects on the formation and accumulation of PAN and PPN. High concentrations of PAN and PPN occur every midnight. During day time, high concentrations of PAN and PPN occurred with high concentrations of NO2 when NO concentrations are fairly low. Diurnal variations of O3 and PAN are very similar to each other, and a moderate correlation has been indicated between PAN and O3.
2005年8月15日至8月28日期间，使用在线仪器对北京城市空气中的过氧乙酰硝酸酯（PAN）和过氧丙酰硝酸酯（PPN）进行了监测。结果表明，北京城区空气中PAN和PPN的浓度极高，白天PAN和PPN的最高浓度分别为2493.2×10⁻¹²和509.2×10⁻¹²。发现PAN和PPN之间存在很强的相关性，R² = 0.9495，[PPN]/[PAN]的平均比值约为20.2%，这表明与城市空气中的生物源挥发性有机化合物相比，人为源挥发性有机化合物占主导地位。降水对PAN和PPN的形成和积累有很强的负面影响。PAN和PPN的高浓度出现在每天午夜。在白天，当NO浓度相当低时，PAN和PPN的高浓度与NO₂的高浓度同时出现。O₃和PAN的日变化非常相似，并且PAN和O₃之间存在适度的相关性。
