Grieshop Andrew P, Miracolo Marissa A, Donahue Niel M, Robinson Allen L
Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Environ Sci Technol. 2009 Jul 1;43(13):4750-6. doi: 10.1021/es8032378.
The gas-particle partitioning of primary organic aerosol (POA) emissions from a diesel engine and the combustion of hard- and soft-woods in a stove was investigated by isothermally diluting them in a smog chamber or by passing them through a thermodenuder and measuring the extent of evaporation. The experiments were conducted at atmospherically relevant conditions: low concentrations and small temperature perturbations. The partitioning of the POA emissions from both sources varied continuously with changing concentration and temperature. Although the POA emissions are semivolatile, they do not completely evaporate at typical atmospheric conditions. The overall partitioning characteristics of diesel and wood smoke POA are similar, with wood smoke being somewhat less volatile than the diesel exhaust. The gas-particle partitioning of aerosols formed from flash-vaporized engine lubricating oil was also studied; diesel POA is somewhat more volatile than the oil aerosol. The experimental data from the dilution- and thermodenuder-based techniques were fit using absorptive partitioning theory to derive a volatility distribution of the POA emissions from each source. These distributions are suitable for use in chemical transport models that simulate POA concentrations.
通过在烟雾箱中对柴油发动机排放的一次有机气溶胶（POA）以及炉灶中硬木和软木燃烧产生的POA进行等温稀释，或者使其通过热脱附器并测量蒸发程度，研究了它们的气粒分配情况。实验在与大气相关的条件下进行：低浓度和小的温度扰动。两种来源的POA排放的分配随浓度和温度的变化而持续变化。尽管POA排放是半挥发性的，但在典型的大气条件下它们不会完全蒸发。柴油和木烟POA的总体分配特征相似，木烟的挥发性略低于柴油尾气。还研究了由闪蒸的发动机润滑油形成的气溶胶的气粒分配；柴油POA的挥发性略高于油气溶胶。使用吸收分配理论对基于稀释和热脱附器技术的实验数据进行拟合，以得出每种来源的POA排放的挥发性分布。这些分布适用于模拟POA浓度的化学传输模型。
