[Emission Characteristics of Polycyclic Aromatic Hydrocarbons and Their Derivatives from Exhaust PM2.5 of China Ⅴ and China Ⅵ Diesel Trucks Based on On-road Measurements].

Q2 Environmental Science
Gang-Li Sun, Da-Wei Niu, Nan Zhang, Ya-Qin Ji, Li-Ping Wu, Xue-Yan Zhao, Wen Yang
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引用次数: 0

Abstract

Exhaust emissions from diesel vehicles are one among the major sources of PM2.5 and polycyclic aromatic hydrocarbons (PAHs) emitted by diesel vehicles are of concern due to their notable impact on health. To better understand the toxicity of diesel vehicle emissions, we used an on-road sampling system to collect PM2.5 samples from four light-duty diesel trucks (LDDTs) and two heavy-duty diesel trucks (HDDTs) under the China Ⅴ and China Ⅵ emission standard. Further, 16 polycyclic aromatic hydrocarbons (pPAHs), 18 nitro-polycyclic aromatic hydrocarbons (NPAHs), and five oxygenated polycyclic aromatic hydrocarbons (OPAHs) were analyzed by GC-MS, and mileage-based emission factors were calculated. The results showed that a decrease in emission factors (EFs) of PM2.5-bound pPAHs, NPAHs, and OPAHs was observed with improved emission standards. The EFs of pPAHs, NPAHs, and OPAHs from LDDTs of the China Ⅵ emission standard were (217.92±109.92), (5.21±2.51), and (10.74±5.99) μg·km-1, respectively, which were reduced by 63%, 55%, and 66% compared to those with China Ⅴ. Due to incomplete combustion, higher emission factors (EFs) were observed for HDDTs than for LDDTs with the same emission standard (China Ⅴ). The EFs of PM2.5-bound pPAHs, NPAHs, and OPAHs emitted from the diesel vehicles were higher with increasing mileages, which was related to increased engine wear. Phenanthrene and fluorenone were the most abundant pPAHs and OPAHs components, while 5-nitro acenaphthene and 2-nitro fluoranthrene + 3-nitro fluoranthrene were the major NPAHs components. The benzo (a) pyrene equivalent toxicity (BaPeq) of pPAHs, NPAHs, and OPAHs of China Ⅵ vehicles was significantly reduced compared to that of China Ⅴ vehicles, which might be related to improvements in exhaust technology. The emission results showed that the diesel vehicles of the three largest-amount models in Luohe City emitted 1 965 kg pPAHs, 33 kg NPAHs, and 105 kg OPAHs, respectively. The emissions of PAHs and their derivatives were mainly from the China V heavy-duty diesel vehicles, suggesting the need to strengthen the control of this model. The results of this study will be valuable for formulating more stringent regulations and emission control technologies for PAHs and their derivatives and for the protection of human health.

[基于道路测量的中国Ⅴ和Ⅵ柴油车尾气PM2.5多环芳烃及其衍生物排放特征]。
柴油车尾气排放是PM2.5的主要来源之一,柴油车排放的多环芳烃(PAHs)对人体健康的影响显著,令人关注。为了更好地了解柴油车排放的毒性,我们使用道路采样系统收集了中国Ⅴ和Ⅵ排放标准下的四辆轻型柴油卡车(LDDTs)和两辆重型柴油卡车(HDDTs)的PM2.5样本。采用气相色谱-质谱法分析了16种多环芳烃(pPAHs)、18种硝基多环芳烃(NPAHs)和5种含氧多环芳烃(OPAHs),并计算了基于里程的排放因子。结果表明,随着排放标准的提高,pm2.5结合的多环芳烃、非环芳烃和多环芳烃的排放因子(EFs)有所下降。中国Ⅵ排放标准ldts中多环芳烃、非环芳烃和多环芳烃的排放系数分别为(217.92±109.92)、(5.21±2.51)和(10.74±5.99)μg·km-1,分别比中国Ⅴ降低63%、55%和66%。由于不完全燃烧,在相同排放标准下,HDDTs的排放因子(EFs)高于LDDTs(中国Ⅴ)。柴油车排放的pm2.5结合的多环芳烃、非环芳烃和多环芳烃的EFs随着行驶里程的增加而增加,这与发动机磨损的增加有关。其中,菲和芴酮是最丰富的多环芳烃和多环芳烃成分,5-硝基苊和2-硝基氟蒽+ 3-硝基氟蒽是主要的NPAHs成分。与中国Ⅴ汽车相比,中国Ⅵ汽车的多环芳烃、非环芳烃和多环芳烃的苯并(a)芘当量毒性(BaPeq)显著降低,这可能与排气技术的改进有关。排放结果表明,漯河市三种最大排放车型的柴油车排放的多环芳烃分别为1965 kg、33 kg和105 kg。多环芳烃及其衍生物的排放主要来自国五重型柴油车,表明需要加强对该车型的控制。这项研究的结果将对制定更严格的多环芳烃及其衍生物法规和排放控制技术以及保护人类健康具有重要价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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