Characterization of fine primary biogenic organic aerosol in an urban area in the northeastern United States

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• 作者：Esther Coz ; Begoñ ; a Artí ; ñ ; ano ; Lisa M. Clark ; Mark Hern ; ez ; Allen L. Robinson ; Gary S. Casuccio ; Traci L. Lersch ; Spyros N. P ; is
• 关键词：Carbohydrates ; Primary biogenic organic aerosols ; SEM/EDX
• 刊名：Atmospheric Environment
• 出版年：2010
• 出版时间：October 2010
• 年：2010
• 卷：44
• 期：32
• 页码：3952-3962
• 全文大小：980 K

文摘

Scanning electron microscopy coupled to energy-dispersive x-ray spectroscopy (SEM/EDX) was used to quantify individual bioparticles in PM_2.5 samples collected during the Pittsburgh Air Quality Study. Microscopy-based estimates of primary biogenic organic aerosol (PBOA) mass were compared to carbohydrate mass associated with PM_2.5. Carbohydrates show substantial seasonal variations, with higher concentrations in the spring and the fall. During the summer, carbohydrates were about 30 % of the estimated PBOA concentrations, but in the winter carbohydrate concentrations often greatly exceeded the PBOA mass estimate. Spores and insect detritus were the most abundant PBOA types in the summer samples, while winter samples were comprised predominantly of a mixture of microorganisms, insect and vegetative detritus. During the summer PBOA contributed on average 6.9 ± 5.4 % by mass of the PM_2.5 versus 3.3 ± 1.4 % of the PM_2.5 mass during the winter.