Abstract
The chemical states of iron in airborne particles collected by the Andersen sampler have been investigated by Mossbauer technique to find an indicator effective to estimate contribution of human activities which can be derived merely from measurements at room temperature. The fine particles (<1.1 μm), known to be emitted from combustion processes, have smaller Fe2+/Fe3+ ratios than the coarse particles (>7.0 μm) in all sampling sites. Fe2+/Fe3+ ratios of the samples collected from the urban area are smaller than those from the suburban area in every particle size. These facts suggest that the Fe2+/Fe3+ ratio can be an indicator of anthropogenic contribution.
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