ATMOSPHERIC OCCURRENCE OF 2-NITROBENZANTHRONE ASSOCIATED WITH AIRBORNE PARTICLES IN CENTRAL TOKYO

Abstract

Abstract 2- and 3-Nitrobenzanthrones (NBAs) in airborne particles collected in central Tokyo on a seasonal basis from 1996 to 2001 are quantified and possible sources are investigated. The concentrations of 2- and 3-NBA are found to range from 49 to 831 fmol m–3and 0.5 to 3.5 fmol m–3, while the nitrated polycyclic hydrocarbons 1-nitropyrene and 2-nitrofluoranthene are found at concentrations of 100–492 fmol m–3 and 10–97 fmol m–3. Significant linear correlations are identified between 2-NBA and NO2, a photochemical product, suggesting that 2-NBA is formed by atmospheric reactions of benzanthrone initiated by hydroxyl or nitrate radicals in the presence of NO2. 2-NBA is not correlated with directly emitted compounds such as 1-nitropyrene. The concentration ratio of 2-NBA to 1-nitropyrene is 5 or greater in all samples. Nitrated polycyclic aromatic compounds formed by atmospheric reactions therefore appear to represent a substantial contribution to the mutagenicity of airborne particulate matter. Keywords: 2-Nitrobenzanthroneairborne particlesatmospheric nitrationPAH This work was supported in part by a Grant-in-Aid for Scientific Research (Nos. 16710030 and 14780409) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.

Keywords

Affiliated Institutions

• Tokyo Institute of Technology JP
• Tokyo University of Agriculture and Technology JP

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