Abstract
Open burning was carried out for rice straw samples with moisture contents of 0%, 5%, 10%, 15%, 20%, 25%, and 30%, respectively. The 10 EPA priority polycyclic aromatic hydrocarbons (PAHs) compounds plus naphthacene and perylene were analyzed by means of GC/MS. Total particulate PAHs emission varied between 1 and 38 mg/kg for12 species-specific PAHs. Experimental results showed that water has a depression effect on PAHs emission during rice straw burning. The lowest emission of total particulate PAHs was obtained when rice straw with 15% moisture content was burned. 11 species-specific PAHs showed the lowest emissions within 10–20% moisture content exclusive of naphthacene. In addition, higher emission was observed for intermediate molecular weight compounds such as fluoranthene, pyrene, benz[a]anthracene and chrysene, and relatively lower emission for heavier molecular weight compounds such as perylene, benzo[a]pyrene and dibenz[ah]anthracene.
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