Organic components of aerosols in a forested area of central Greece

Total suspended particulate matter was collected ih a Abies boressi forest in central Greece during the period of 20 July-12 August 1997. Filters were extracted with solvents and the soluble content was separated into functio nal group fractions for analyses by gas chromatography/mass spectrometry. A total of 1050 different compounds could be identified in the various extra cts. The lipid material consisted primarily of n-alkanes, n-alkan-2-ones, n -alkanols and n-fatty acids, with a higher concentration of molecular weigh ts > C-20, derived from vascular plant waxes. Biomarkers for vegetation sou rces such as phytosterols and triterpenic compounds were also detected. Mic robial components(< C-20), petroleum residues and pyrogenic aromatic hydroc arbons were present in the various aerosol extracts. Photochemical products deriving from volatile organic compounds emitted by vegetation or from ant hropogenic precursors were also detected. These secondary organics include alkane derivatives, di- and carboxylic acids, nitroaromatics and many terpe ne photo-oxidation products. (C) 2000 Elsevier Science Ltd. All rights rese rved.