Photo-oxidation products of a-pinene in coarse, fine and ultrafine aerosol: A new high sensitive HPLC-MS/MS method

摘要

Oxidation products of a-pinene represent a fraction of organic matter in the environmental aerosol. alpha-pinene is one of most abundant monoterpenes released in the atmosphere by plants, located typically in boreal, temperate and tropical forests, This primary compound reacts with atmospheric oxidants, such as O-3, O-2, OH radicals and NOx, through the major tropospheric degradation pathway for many monoterpenes under typical atmospheric condition. Although several studies identified a series of by-products deriving from the alpha-pinene photo-oxidation in the atmosphere, such as pinic and cis-pinonic acid, the knowledge of the mechanism of this process is partially still lacking. Thus, the investigation of the distribution of these acids in the different size aerosol particles provides additional information on this regard.