## 3 Results and Discussion
### Source Profile of Biomass Burning
PAHs appeared as in the order of phenanthrene \(>\) fluoranthene \(>\) pyrene; the emission of PAHs from woods appeared higher comparing to that from the herbaceous plant. In particular, retene was detected from the 3 ones among the 4 herbaceous plants with corresponding average concentration of 0.07 mg/g-OC, whereas the wood was detected from all 8 crops with corresponding average concentration of 0.92 mg/g-OC, which was higher than that of the herbaceous plant. In particular, retene, which is emitted from woods, was discharged highly from specimens of pine tree wherein the concentration in pine needle and in stalk exhibited 1.07 mg/g-OC and 6.11 mg/g-OC, respectively. For the case of alkanes, the detected ratios from woods and herbaceous plants appeared varying according to compounds of analysis. In the analyses from C\({}_{11}\) to C\({}_{29}\), the concentrations of wood exhibited higher emission than concentrations of herbaceous plant, whereas in the analyses from C\({}_{30}\) to C\({}_{40}\), the concentrations of herbaceous plant manifested characteristics of higher emission than that of concentrations of wood. In addition, by the chemical classification into hard- and soft ones, the 5 compounds of analysis among alkanes (n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane and norpristane) appeared only from the soft ones. The compounds employed for the analysis of WSOC occupied approximately 22% of entire compounds, which were equivalent to 7% of the weight of PM\({}_{2.5}\). In regard to each item employed for the analysis, the alkanoic acid appeared as 4.94% of the weight of PM\({}_{2.5}\), while the levoglucosan, di-carboxylic acid, benzene carboxylic acid and amino acids appeared with 2.13%, 0.16%, 0.02% and 0.02% of the weight of PM\({}_{2.5}\), respectively. Major chemical components contained in the alkanoic acid which manifested the highest content in WSOC appeared in the order of hexadecanoic acid \(>\) triacontanoic acid \(>\) oleic acid \(>\) tetradecanoic acid \(>\) linoleic acid \(>\) dehydrodiabetic acid. hexadecanoic acid exhibited higher content in alkanoic acid group and it occupied approximately 25.25% among entire alkanoic acid, while triacontanoic acid, oleic acid, tetradecanoic acid, linoleic acid and dehydrodiabetic acid appeared with respective occupancies of 8.20%, 7.16%, 6.95%, 6.36% and 6.25%; the six compounds occupied more than 60% of the entire 27 compounds. In regard to the comparison of specimens of woods with herbaceous plant, the content of octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid and pentadecanoic acid appeared higher in specimens of woods than in herbaceous plant; the other compounds appeared with higher content in specimen of herbaceous plant. With regard to the classification of compounds according to respective characteristics, the average concentration of alkanoic acid in the soft specimens appeared as 110.60 mg/g-OC while the concentration of alkanoic acid in the hard specimens appeared as 57.88 mg/g-OC, signifying the concentration of alkanoic acid appeared increasing in accordance with decreasing density of specimen.