Grupo de Investigación en Gestión y Modelación Ambiental -GAIA, Escuela Ambiental, Facultad de Ingeniería, Universidad de Antioquia UdeA, Calle 70 No.52-21, Medellín, Colombia.
Departamento de Ingeniería Mecánica, Universidad de Antioquia UdeA.
J Environ Sci (China). 2021 Mar;101:326-338. doi: 10.1016/j.jes.2020.08.022. Epub 2020 Sep 11.
This work assessed the impact of fuelling an automotive engine with palm biodiesel (pure, and two blends of 10% and 20% with diesel, B100, B10 and B20, respectively) operating under representative urban driving conditions on 17 priority polycyclic aromatic hydrocarbon (PAH) compounds, oxidative potential of ascorbic acid (OP), and ecotoxicity through Daphnia pulex mortality test. PM diluted with filtered fresh air (WD) gathered in a minitunel, and particulate matter (PM) collected directly from the exhaust gas stream (W/oD) were used for comparison. Results showed that PM collecting method significantly impact PAH concentration. Although all PAH appeared in both, WD and W/oD, higher concentrations were obtained in the last case. Increasing biodiesel concentration in the fuel blend decreased all PAH compounds, and those with 3 and 5 aromatic rings were the most abundant. Palm biodiesel affected both OP and ecotoxicity. While B10 and B20 exhibited the same rate of ascorbic acid (AA) depletion, B100 showed significant faster oxidation rate during the first four minutes and oxidized 10% more AA at the end of the test. B100 and B20 were significantly more ecotoxic than B10. The lethal concentration LC50 for B10 was 6.13 mg/L. It was concluded that palm biodiesel decreased PAH compounds, but increased the oxidative potential and ecotoxicity.
这项工作评估了在代表城市驾驶条件下，用棕榈生物柴油（纯生物柴油和分别与柴油混合 10%和 20%的 B100、B10 和 B20）为汽车发动机提供燃料对 17 种优先多环芳烃（PAH）化合物、抗坏血酸氧化潜力（OP）和水蚤死亡率测试的生态毒性的影响。用过滤的新鲜空气（WD）稀释的 PM 在 minitunel 中收集，直接从废气流中收集的颗粒物（W/oD）用于比较。结果表明，PM 收集方法对 PAH 浓度有显著影响。尽管所有 PAH 都出现在 WD 和 W/oD 中，但在后一种情况下浓度更高。燃料混合物中生物柴油浓度的增加降低了所有 PAH 化合物，而具有 3 和 5 个芳环的化合物含量最高。棕榈生物柴油影响 OP 和生态毒性。虽然 B10 和 B20 表现出相同的抗坏血酸（AA）消耗率，但 B100 在最初的四分钟内表现出更快的氧化速率，并且在测试结束时氧化了 10%更多的 AA。B100 和 B20 比 B10 更具生态毒性。B10 的致死浓度 LC50 为 6.13mg/L。结论是，棕榈生物柴油降低了 PAH 化合物的含量，但增加了氧化潜力和生态毒性。
