INFLUENCE OF HUMIDITY, SUNLIGHT, AND TEMPERATURE ON THE DAYTIME DECAY OF POLYAROMATIC HYDROCARBONS ON ATMOSPHERIC SOOT PARTICLES
INFLUENCE OF HUMIDITY, SUNLIGHT, AND TEMPERATURE ON THE DAYTIME DECAY OF POLYAROMATIC HYDROCARBONS ON ATMOSPHERIC SOOT PARTICLES
复制标题
DOI：
10.1021/es00166a012
复制
发表时间：
1988-01-01
影响因子：
11.4
通讯作者：
BELL, DA
中科院分区：
文献类型：
--
作者：
KAMENS, RM;GUO, Z;BELL, DA
在本文中，我们试图根据湿度、太阳辐射和温度的影响，量化大气烟尘颗粒上多环芳烃 (PAH) 的损失。稀释的住宅木材烟雾和内部汽油燃烧排放物在 25 立方米室外聚四氟乙烯薄膜室中在自然阳光下单独老化。在过滤器上收集烟灰颗粒并分析 PAH。在每个实验中，计算单个 PAH 消失的一阶速率常数。然后根据木材烟雾实验生成九种不同 PAH 的速率表达式，作为湿度、光和温度的函数。据估计，在中等湿度和温度下，PAH 在室内气氛中的半衰期约为 1 小时。在非常低的阳光角度、非常低的水蒸气浓度或非常低的温度下，许多化合物的 PAH 在空气中烟灰颗粒上的白天半衰期会延长至数天。
In this paper we have attempted to quantify the loss of polyaromatic hydrocarbons (PAH) on atmospheric soot particles with respect to the effects of humidity, solar radiation, and temperature. Dilute residential wood smoke and internal gasoline combustion emissions were individually aged in the presence of natural sunlight in 25-m3 outdoor Teflon film chambers. Soot particles were collected on filters and analyzed for PAH. In each experiment first-order rate constants were computed for the disappearance of individual PAH. Rate expressions as a function of humidity, light, and temperature were then generated for nine different PAH from the wood smoke experiments. Estimates suggest that, at moderate humidities and temperatures, PAH half-lives in the chamber atmosphere were of the order of 1 h. At very low angle sunlight, very low water vapor concentrations, or very low temperatures, PAH daytime half-lives on airborne soot particles increased for many compounds to a period of days.