PM2.5-bound polycyclic aromatic hydrocarbons (PAHs) and nitrated-PAHs (NPAHs) emitted by gasoline vehicles: Characterization and health risk assessment.
PM2.5-bound polycyclic aromatic hydrocarbons (PAHs) and nitrated-PAHs (NPAHs) emitted by gasoline vehicles: Characterization and health risk assessment.
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DOI：
10.1016/j.scitotenv.2020.138631
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
Tong Zhao;Lingxiao Yang;Qi Huang;Wan Zhang;Shengfei Duan;H. Gao;Wen-xing Wang
中科院分区：
文献类型：
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作者：
Tong Zhao;Lingxiao Yang;Qi Huang;Wan Zhang;Shengfei Duan;H. Gao;Wen-xing Wang
在底盘和发动机台架上对54辆不同排放标准（国1 ~国5）在用汽油车PM2. 5和常规气态污染物中的17种多环芳烃（PAHs）和8种硝化多环芳烃（NPAHs）进行了检测。随着排放标准的提高，PM2.5中的多环芳烃和非多环芳烃的排放量有所减少。在5种排放标准下，行驶里程> 10万km的机动车排放的PM2. 5中总PAHs和NPAHs的排放因子均大于行驶里程<10万km的机动车。进气道燃油喷射发动机排放的PM2.5结合的多环芳烃和非多环芳烃的排放因子均大于汽油直喷发动机。PM2.5结合态多环芳烃和非多环芳烃的排放量与CO排放量的相关性较小，而碳氢化合物（HC）排放量与PM2.5结合态多环芳烃排放量的相关性较强。NPAHs和NOx的排放量呈负相关。与中国1和中国2相比，中国3、中国4和中国5的总多环芳烃和非多环芳烃的毒性（TEQs）显著降低，这可能与排放技术的改进有关。虽然NPAHs的EFs显著低于PAHs，但其TEQ却高于PAHs，说明汽油车排放的NPAHs的毒性效应大于PAHs。
Seventeen polycyclic aromatic hydrocarbons (PAHs) and eight nitrated PAHs (NPAHs) in PM2.5and conventional gaseous pollutants exhausted from 54 in-use gasoline vehicles encompassing different emission standards (China 1 to China 5) were tested on the chassis and engine dynamometric test bench. With the increase of emission standards, a decrease in the emissions of PM2.5-bound PAHs and NPAHs was detected. The emission factors (EFs) of total PAHs and NPAHs in PM2.5emitted by the vehicles with a mileage of >100,000 km were greater than that emitted by the vehicles with driving mileage of <100,000 km under all the five emission standards. The EFs of PM2.5-bound PAHs and NPAHs emitted from port fuel injection engines were larger than that from gasoline direct injection engines. The emissions of PM2.5-bound PAHs and NPAHs were less correlated with the exhaust of CO, while the hydrocarbon (HC) emissions were strongly correlated with the PM2.5-bound PAHs emissions. The emissions of NPAHs and NOx had an inverse correlation. The toxic (TEQs) of total PAHs and NPAHs in China 3, China 4 and China 5 were significantly reduced compared to China 1 and China 2, which may be related to exhaust technology improvements. Although the EFs of NPAHs were significantly lower than those of PAHs, the TEQs of NPAHs were higher, which indicates that the toxic effect of NPAHs emitted by gasoline vehicles were stronger than PAHs.