Polycyclic aromatic hydrocarbons in diesel emission, diesel fuel and lubricant oil
Polycyclic aromatic hydrocarbons in diesel emission, diesel fuel and lubricant oil
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DOI：
10.1016/j.fuel.2016.08.054
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发表时间：
2016-12-01
期刊：
影响因子：
7.4
通讯作者：
Correa, Sergio Machado
中科院分区：
文献类型：
--
作者：
de Souza, Carolina Vieira;Correa, Sergio Machado
这项研究确定了巴西销售的柴油和不同使用时间采样的润滑油中多环芳烃的优先浓度。采用硅酸镁（硅酸镁）作为固相的固相萃取（SPE）技术用于分离柴油和润滑油样品中含有芳香族成分的馏分。通过气相色谱法与质谱法联用进行测量。润滑油中的 PAH 优先分布与柴油中的 PAH 分布相似，其中萘、菲和芘占主导地位。将巴西柴油样品中的多环芳烃浓度与使用相同巴西柴油燃料的车辆排气中各自多环芳烃的排放因子进行比较，以估计柴油中存在的多环芳烃有多少在燃烧过程中保持不变。废气中的 PAH 排放因子（μ g L-1 柴油）与其在柴油中的各自浓度（μ g L-1）之间的比率范围为 0.01 +/- 0.02 至 0.05 +/- 0.029，具体取决于 PAH。这些值表明，柴油中至少 95-99% 的 PAH 被破坏，在燃烧过程中转化为其他化合物，和/或保留在润滑油储层中。另一方面，柴油中 PAH 浓度较高，废气排放因子也较高，这表明柴油中的 PAH 对 PAH 总排放量有贡献。因此，减少柴油中多环芳烃的含量可能有助于抑制这些化合物的排放，并有助于改善空气质量。 (C) 2016 Elsevier Ltd. 保留所有权利。
This study determined the priority PAHs concentrations in diesel fuel sold in Brazil and in lubricant oil sampleted in different usage times. The solid phase extraction (SPE) techinique using florisil (magnesium silicate) as solid phase was used to separate the fraction containing aromatic components present in the diesel fuel and lubricating oil samples. The measurements were performed by gas chromatography coupled to mass spectrometry. The PAH priority profile in lubricant oil was similar to the PAH profile in diesel where Naphthalene, Phenanthrene and Pyrene were dominant. The PAHs concentration in Brazilian diesel fuel sample were compared with the emission factors of their PAHs respective in exhaust of a vehicle fueled with the same Brazilian diesel fuel in order to estimate how much of the PAHs present in diesel remains unchanged during combustion. The ratio between the PAHs emission factors in exhaust (mu g L-1 diesel) and their respective concentrations in diesel fuel (mu g L-1) ranged from 0.01 +/- 0.02 to 0.05 +/- 0.029, depending on the PAH. These values indicate that at least 95-99% of the PAHs identified in diesel fuel were destroyed, converted into other compounds during the combustion, and/or retained in the lubricant oil reservoir. On the other hand, PAHs with higher concentrations in diesel also had higher exhaust emission factors, which suggests that the PAHs from diesel have a contribution to total PAH emissions. Therefore, reducing the PAHs content in diesel will probably contribute to curbing emissions of these compounds and help improve air quality. (C) 2016 Elsevier Ltd. All rights reserved.