Distribution of stable isotopes of particulate lead in the atmosphere in Osaka, Japan

[Abstract] Poorly soluble particulate materials (PMs) in the atmosphere were collected in Osaka, Japan, over nine months, and the distribution of stable isotopes of lead in PMs was observed for elucidation of original sources of PMs. PMs were divided into three groups depending on their particle sizes, PM-1 (＞10μm), PM-2 (10-2.5μm), and PM-3 (＜2.5μm). There were no differences in lead concentration among the three groups. Lead isotope ratios of total PMs during nine months were 0.880±0.011 for ^Pb, 2.137±0.033 for ^Pb, and 0.413±0.007 for ^Pb. There was no relationship between ^Pb and ^Pb in PM-2 and PM-3, although there was a significant relationship between both ratios in PM-1. Ratios of both ^Pb and ^Pb in PM-1 and PM-2 remained similar in each month, but both ratios in PM-3 dramatically raised and fell during nine months. From the present study, there may be various sources of lead PMs in the atmosphere, and the lead source of PM-3 may be different from PM-1 and PM-2.本文データはCiNiiから複製したものである