[Emission Characteristics of Dehydrated Sugar and Acephenanthrylene in Particles from Tropical Forest Burning]

Forest vegetation burning is an important source of atmospheric particulates. In this study, 22 kinds of typical tropical trees in Southeast Asia, which can be divided into evergreen trees, deciduous trees, and shrubs, were selected for experimentation. The emission characteristics of dehydrated sugar, acephenanthrylene, aceanthrylene, and retene were analyzed. The trend of the average emission factor for total sugar was evergreen trees (1.56 g·kg^-1±1.01 g·kg^-1) < shrubs (1.99 g·kg^-1±0.64 g·kg^-1) < deciduous trees (5.38 g·kg^-1±7.18 g·kg^-1). Furthermore, the trend of the average emission factor of acephenanthrylene was evergreen trees (2.63 mg·kg^-1±2.44 mg·kg^-1) ≈ shrubs (2.46 mg·kg^-1g±2.14 mg·kg^-1) < deciduous trees (6.07 mg·kg^-1±8.50 mg·kg^-1). For ratios of organic biomarkers, the average ratios of Lev/Man for trees and shrubs were 20.6±11.90 and 23.2±9.20, respectively. The range of Lev/Man was 5.8-51.5 in this study. The average ratios of AP/AC for trees and shrubs were 7.13±5.18 and 5.53±1.51, respectively. Compared with the dehydrated sugar, which was affected by more conditions, the analysis methods of aromatic hydrocarbons were simple. Furthermore, although the ratio of AP/AC was less stable than that of FL/PY in this manuscript, AP/AC was less affected by other sources of pollution and had higher specificity. In conclusion, the advantages and disadvantages of each organic biomarker can be synthetically considered in terms of biomass source analysis in order to improve accuracy, and acephenanthrylene was a better choice than other biomarkers.