Abstract
Abstract Organic matter in aerosols is derived from two major sources and is admixed depending on the geographic area. These sources are biogenic detritus (e.g. plant wax, microbes, etc.) and anthropogenic emissions (e.g. oils, soot, etc.). Both biogenic detritus and some of the anthropogenic emissions contain organic materials (C14- C40 +) extractable by solvent, which have unique and distinguishable compound distribution patterns. Molecular composition analysis has been applied to such extracts after suitable chemical separation into subfractions (i.e. hydrocarbons, ketones, fatty acids, fatty alcohols, and wax esters). Microbial and vascular plant lipids are the dominant biogenic residues and petroleum hydrocarbons, with lesser amounts of the pyrogenic polynuclear aromatic hydrocarbons (PAH), are the major anthropogenic residues. These lipid fractions are quantified and characterized in terms of their contents of both homologous compound series and specific molecular markers. Samples from rural sites c...
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