Abstract
In order to characterize PAHs emissions of diesel engine fuelled with diesel and its blend (B20, B40). In the particle phase, PAHs in engine exhausts were collected by fiberglass filters using Electrical Low Pressure Impactor (ELPI) and then determined by a high performance liquid chromatography with a fluorimetric detector (HPLC‐FL). The main content in exhaust gases from diesel engine, regardless the type of applied fuel, is constituted by the particles fraction of diameter <0.25 μm. Particles sized <0.25 μm constituted on average approximately 68% of particles in diesel exhaust gases and approx. 50% of particles emitted by biodiesel B20 and B40. When the B100 bioester additive was applied, the total emission of particles was reduced thus the volume of toxic substances adsorbed on them was lower. The analysis of chemical composition of <0.25 μm exhaust gas fraction showed that there were mainly 3‐ and 4‐ring aromatic hydrocarbons in the exhaust gas of diesel fuel while in B40 single PAHs with the number of rings of 4 and 5 were detected. An application of ELPI permitted a further separation of <0.25 μm particle’s fraction and a real‐time determination of interalia number, mass, and surface concentrations.
Highlights
In an atmospheric air and in the air surrounding people in work and life premises, there are particles which may have a negative impact on human health
Diesel engine exhaust emissions are of a major interest to researchers at national and international levels as demonstrated both by numerous publications resulting from analyses of gas and particular phase, evaluations of occupational and environmental exposure, and toxicological and epidemiological studies, and by reviewing publications indicating directions for further research in the area [1,2,3]. e publications are concerned mainly on exhaust gases emitted during combustion of conventional fuels
At the same time a question arises whether alternative fuels bring about bene ts only or may induce unfavourable effects on environment and human health, similar to the effects caused by multicompound mixtures of harmful xenobiotics created as a result of combustion of conventional fuels, emitted to the environment both in a gas phase and in the form of ne and ultra ne particles [7,8,9]
Summary
In an atmospheric air and in the air surrounding people in work and life premises, there are particles which may have a negative impact on human health. At the same time a question arises whether alternative fuels bring about bene ts only or may induce unfavourable effects on environment and human health, similar to the effects caused by multicompound mixtures of harmful xenobiotics created as a result of combustion of conventional fuels (e.g., carcinogenic, mutagenic and fertility impairing ones), emitted to the environment both in a gas phase and in the form of ne and ultra ne particles [7,8,9]. Erefore, this paper focuses on the use of low-pressure cascade impactor (Electrical Low Pressure Impactor ELPI) for the separation of individual fractions of ne particles of diesel exhaust gases resulting from a combustion of biofuels and aims to investigate the content of polycyclic aromatic hydrocarbons (PAHs)
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