Abstract
We performed a source apportionment for particulate matter under 2.5 μm with the diameter (PM2.5) based on individual particle analyses using an electron probe microanalyzer (FE-SEM/EPMA). The analyzed particles were collected from the air environment near to a traffic route in June (before diesel vehicle emissions control regulations) and December (after regulations) 2003. From the results of the size, shape, and components of the particles, five or more sources of the particles were estimated. The rates for the contribution of diesel exhaust particle (DEP) were higher than that of the other sources. DEPs were further classified based on information concerning light elements according to the X-ray spectrum patterns. The X-ray spectrum patterns of DEPs collected before diesel vehicle emissions control regulations were different from that collected after the regulations. We could obtain this information about PM2.5 and DEPs, which could not be obtained by the conventional method. Therefore, it is concluded that the combination of individual particle analysis based on FE-SEM and EPMA is one of the most powerful techniques for obtaining detailed information about PM2.5.
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