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Emission characteristics of polycyclic aromatic hydrocarbons from three types of agricultural straw burning smoke |
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Abstract Three straw burning smokes in lab simulating straw open burning mode were collected by using a sampler of high-flow capacity. 34particulate polycyclic aromatic hydrocarbons (PAHs) were analyzed by GC-MS to investigate their emission factors and diagnostic ratios. The emission factors of PAHs from three straw burning smoke ranged from about 644.18~1798.13μg/kg. Four-rings PAHs are the most abundant PAH species in all samples, and their proportion to total PAHs ranged from 38.8% to 58.8%. The contributions of six-rings PAHs in TSP samples ranged from 5.72% to 15.17%. Although the contributions of six-rings PAHs were low in total PAHs, their impacts on human health and environment were critical for its high carcinogenicity. High-rings PAH Dibenzo [a,e] fluoranthene was firstly determined from straw burning smokes, its emission factor from corn, rice and wheat straw burning smoke was measured at about 6.70, 2.77 and 2.92μg/kg, respectively. Some diagnostic ratios such as Benzo(a)pyrene to Benzo[ghi]perylene (BaP/BghiP), phenanthrene to phenanthrene plus anthracene (Phe/(Phe+Ant)) and fluoranthene to fluoranthene plus pyrene (Flu/(Flu+ Pyr)) were also identified in this study.
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Received: 20 August 2014
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