Carbon clusters in 50 nm urban air aerosol particles quantified by laser desorption-ionization aerosol mass spectrometer

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• 作者：Totti Laitinen ; Tuukka Pet盲j盲 ; John Backman ; Kari Hartonen ; Heikki Junninen ; Jos茅 Ruiz-Jim茅nez ; Douglas Worsnop ; Markku Kulmala ; Marja-Liisa Riekkola
• 关键词：Laser AMS ; Ultrafine particles ; Urban aerosols ; Carbon clusters ; Quantitative aerosol analysis ; PSAP
• 刊名：International Journal of Mass Spectrometry
• 出版年：15 January, 2014
• 年：2014
• 卷：358
• 期：Complete
• 页码：17-24
• 全文大小：2121 K

文摘

A standard reference material for carbon cluster measurements by laser aerosol mass spectrometer (laser AMS) was prepared from 50 nm graphite particles suspended in toluene with assistance of high power sonication probe (72 h). The lowest measured concentration of the 50 nm graphite suspension was 3.7 pg. With the aid of the standards, carbon clusters from C₁₄ to C₁₉ were quantified in 50 nm urban air particles. The average amount per sample was 7.2%, ranging from 0.01 to 30.8%. The results also revealed that Laser AMS is capable of detecting fullerenes up to C₁₀₀ in the 50 nm urban air particles. For comparison, qualitative ambient 50 nm particle measurements by laser AMS and by a particle soot absorption photometer (PSAP) were performed. The black carbon concentrations measured by PSAP did not correlate with the concentrations of laser AMS carbon clusters, but instead correlated strongly with the total collected mass of particles.