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您的检索式：作者名="Cheolsoo Lim"
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| 1 | Characterizations of organic compounds in diesel exhaust particulates显示文摘To characterize how the speed and load of a medium-duty diesel engine affected the organic compounds in diesel particle matter(PM) below 1 μm, four driving conditions were examined. At all four driving conditions, concentration of identifiable organic compounds in PM ultrafine(34–94 nm) and accumulation(94–1000 nm) modes ranged from 2.9 to 5.7 μg/m3 and 9.5 to 16.4 μg/m3, respectively. As a function of driving conditions, the non-oxygencontaining organics exhibited a reversed concentration trend to the oxygen-containing organics. The identified organic compounds were classified into eleven classes: alkanes,alkenes, alkynes, aromatic hydrocarbons, carboxylic acids, esters, ketones, alcohols, ethers,nitrogen-containing compounds, and sulfur-containing compounds. At all driving conditions,alkane class consistently showed the highest concentration(8.3 to 18.0 μg/m3) followed by carboxylic acid, esters, ketones and alcohols. Twelve polycyclic aromatic hydrocarbons(PAHs)were identified with a total concentration ranging from 37.9 to 174.8 ng/m3. In addition, nine nitrogen-containing polycyclic aromatic compounds(NPACs) were identified with a total concentration ranging from 7.0 to 10.3 ng/m3. The most abundant PAH(phenanthrene)and NPACs(7,8-benzoquinoline and 3-nitrophenanthrene) comprise a similar molecular(3 aromatic-ring) structure under the highest engine speed and engine load. | Jaehyun Lim Cheolsoo Lim Sangkyun Kim Jihyung Hong | 2015 | Journal of Environmental Sciences2015，27，8： | 1 |
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