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The effects of load on organic species in diesel particulate matter (DPM).

Liang-F; Lu-M; Keener-TC; Liu-Z
Proceedings of the AAAR 23rd Annual Conference, October 4-8, 2004, Atlanta, Georgia. Mount Laurel, NJ: American Association for Aerosol Research, 2004 Oct; :42
In current decades, there has been a growing interest in quantifying and reducing the amount of diesel particulate emissions from non-road diesel powered engines. Studies have indicated that diesel particulate matter (DPM) can be hazardous to human health since DPM is mainly in the respirable range (< 1microm) and many organic species in DPM, such as polycyclic aromatic hydrocarbons (PAHs) and alkylated PAHs, are considered as potential occupational carcinogens. On January 19, 2001, the U.S. Department of Labor's Mine Safety and Health Administration (MSHA) regulated diesel equipment emissions in underground coal mines and metal/non-metal mines, requiring a final limit of 160 microg/m3 of total carbon January 19, 2006. Many of the current studies focus on chemical composition of on-road and non-road diesel emissions. However, the load variated organic speciation of DPM has not been much studied, while speciation variation of DPM composition is expected due to the different engine operating conditions and fuel usage under different loads The aim of this study is to investigate the effects of load on the distribution of organic species in DPM. In our study, the tests were performed on a non-road diesel generator under loads from 0kW to 75kW. The organic compounds were identified and quantified with GC/MS and classified as n-alkanes, PAHs and alkylated PAHs. The results indicated that the concentrations as well as the species vary with loads, and the increase of loads is associated with the increase of particulates (EC). Under all the studied load conditions, alkylated PAHs take the largest portion. At low loads, methylphenanthrene, dimenthylphenanthrene and trimethylnaphthalene are the most abundant species. With load increasing, more smaller molecules were formed, such as dimethylbenzene and trimethylbenzene. n-Alkanes are also important organics in DPM. At lower loads, heptadecane (C17), octadecane (C18) and nonadecane (C19) are the most abundant species; while at higher loads, the abundant species have shifted to shorter chain n-alkanes (C11-C13).
Particulates; Particulate-dust; Diesel-emissions; Diesel-exhausts; Analytical-processes; Analytical-instruments; Analytical-chemistry
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Personal Protective Technology
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Proceedings of the AAAR 23rd Annual Conference, October 4-8, 2004, Atlanta, Georgia
Performing Organization
University of Cincinnati
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division