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Fine aerosol particles were collected separately during daytime andnighttime at a tropical pasture site in Rondônia, Brazil, during theburning and dry-to-wet transition period in 2002. Total carbon (TC) andwater-soluble organic carbon (WSOC) were measured by evolved gas analysis(EGA). Based on the thermochemical properties of the fine aerosol, therelative amounts of the volatile and refractory compounds were estimated. Itwas found that the thermally refractory (possibly higher molecular weight)compounds dominated the TC composition. Their contribution to TC was higherin the daytime than in the nighttime samples. The relative share of WSOCalso showed a statistically significant diel variation as did its refractoryfraction. Anhydrosugars and phenolic acids were determined by GC-MS andtheir diel variation was studied. Based on the decrease of their relativeconcentrations between the biomass burning and transition periods and theirdistinctly different diel variations, we suggest that the phenolic acids mayundergo chemical transformations in the aerosol phase, possibly towards morerefractory compounds (humic-like substances, HULIS), as has been suggestedpreviously. These conclusions are supported by the results of the thermallyassisted hydrolysis and methylation gas chromatography-mass spectrometry ofthe same filter samples

Diel and seasonal variations in the chemical composition of biomass burning aerosol