Characterizing priority polycyclic aromatic hydrocarbons (PAHs) in particulate matter from diesel and palm oil-based biodiesel B15 combustion

摘要

According to the evidence found in this study, the amount of particulate matter emitted by a diesel engine running at a steady speed and under no load had no statistically significant difference when using a 15% vol. biodiesel blend compared to using diesel fuel. Regarding the 16 priority PAHs' concentration, under the same conditions (only one engine running mode, no load, constant velocity, no dilution tunnel), the biodiesel blend had no statistically significant effect on 10 of them. Whilst it reduced the concentration of acenaphthene, acenaphthylene and anthracene present in the exhaust, it also increased benz(k)fluoranthene, benz(ghi)perylene and pyrene emission. Adding biodiesel increased total PAH concentration. Pyrene was the PAH making the highest total PAH concentration contribution using both fuels; naphthalene and dibenzo(a,h)anthracene made the second and third most significant contributions to total PAH concentrations when using petroleum diesel. As an overall result, adding biodiesel to petroleum diesel had no statistically significant effect on total toxicity equivalent concentration. According to these results, it can be said that adding biodiesel to petroleum diesel did not seem to cause an improvement in the toxicity of exhaust-associated PAH emissions under constant speed, no load conditions. Further work should include the use of a dilution system or a denuder, in order to avoid sampling artifacts that may be the reason to find naphthalene and other PAHs in the particulate phase.