Identification of Molecular Tracers in Organic Aerosols from Temperate Climate Vegetation Subjected to Biomass Burning
Titel:
Identification of Molecular Tracers in Organic Aerosols from Temperate Climate Vegetation Subjected to Biomass Burning
Auteur:
Oros, Daniel R. Simoneit, Bernd R. T.
Verschenen in:
Aerosol science and technology
Paginering:
Jaargang 31 (1999) nr. 6 pagina's 433-445
Jaar:
1999-12-01
Inhoud:
Smoke particulate matter from temperate climate vegetation subjected to controlled burning, both under smoldering and flaming conditions, was sampled by high volume air filtration on precleaned quartz fiber filters. The filtered particles were extracted with dichloromethane and the crude extracts were methylated for separation by thin layer chromatography into hydrocarbon, car bonyl, carboxylic acid ester, and polar fractions, then analyzed by gas chromatog raphy and gas chromatography-mass spectrometry. The major organic components in smoke particles were straight chain aliphatic compounds from vegetation wax and diterpenoid acids (biomarkers) from gum bleed resin. The major natural products altered by combustion included derivatives from phenolic (lignin) and monosaccharide (cellulose) biopolymers and oxygenated and aromatic products from diterpenoids. Biomarkers present as trace components included triterpenoids and phytosterols, both the natural and altered products. Polycyclic aromatic hydrocarbons (PAH) were also present, however, as minor constituents. Although the concentrations of organic compounds in smoke aerosols are highly variable and dependent on combustion temperature, the biomarkers and their combustion alteration products are source specific. They may be utilized as molecular tracers in the atmosphere for determining fuel type and source contributions from biomass burning.
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