DETERMINATION OF OXYGENATED POLYCYCLIC AROMATIC HYDROCARBONS IN DIESEL AND AIR PARTICULATE MATTER SRMs

Margarete Sofie Nocun, Michele S. Schantz

 

Oxygenated polycyclic aromatic hydrocarbons (oxy-PAHs) have recently received much attention in discussions regarding the negative impacts of particulate matter (PM) on human health and the environment. The National Institute of Standards and Technology provides several environmental matrix Standard Reference Materials (SRMs) with certified and reference values for polycyclic aromatic hydrocarbons (PAHs) and nitrated PAHs. In this study, the concentrations of oxygenated PAHs are determined in three air particulate matter SRMs (1649b, 1648a, 2786) and three diesel particulate matter SRMs (1650b, 2975, 1975) using two independent gas chromatography  mass spectrometry (GC-MS) methods. Concentrations of oxy-PAHs were at the mg/kg level with higher overall concentrations in diesel PM. One of the highest oxy-PAH concentrations (up to 5 mg/kg) measured in the air particulate SRMs was for 7, 12-benz[a]anthracenquinone. These results suggest that oxygenated PAHs should not be neglected in the analysis of particulate matter as their concentrations can be as high as those of some PAHs and are one to two orders of magnitude higher than those for nitro-PAHs.