[Simulation Study of the Emission of Polycyclic Aromatic Hydrocarbons and Sugar Alcohols from Biomass Burning].

To measure the emission factors of PM2.5 and its associated PAHs and sugar alcohols, Chinese red pine stick and four crop straw including rice, wheat, corn and cotton were burned in a chamber. In addition, the kinetics of certain compounds were obtained through the irradiation of the glass filters with PM2.5 loading by 500 W mercury lamp. The emission factors of PM2.5 were ranged from (2.26 ± 0.60) g x kg(-1) (Chinese red pine stick) to (14.33 ± 5.26) g x kg(-1) (corn straw). Although the emission factors of the total 19 PAHs differed from (0.82 ± 0.21) mg x kg(-1) (Chinese red pine stick) to (11.14 ± 5.69) mg x kg(-1) (cotton straw), 4 ring PAHs showed predominance over other PAHs accounting for 51% - 71% except Chinese red pine in which retene was the predominant compound. The emission factors of 9 sugar alcohols were ranged from (52.34 ± 50.16) mg x kg(-1) (rice straw) to (238.81 ± 33.62) mg x kg(-1) (wheat straw) with levoglucosan accounting for 72% - 96% of the total sugar alcohols. Both the selected PAHs and levoglucosan associated with PM2.5 followed the first order kinetics. The photolysis kinetic coefficient of PAHs (ring number ≥ 4) was decreased with the increase of PAHs loading in filters. Two PAHs source characteristic ratios such as Flua/( Flua + Py) and IP/(IP + BgP) were relative stable during the irradiation. The photolysis kinetic coefficient of levoglucosan (0.004 5 min(-1)) was comparable to benzo[a]anthracene (0.004 1 - 0.005 0 min(-1)).