6:15 PM - 7:30 PM
[HTT31-P01] Chemical compositions and Sr-Pb isotope ratios of precipitation of Saijo city in Ehime prefecture
Keywords:precipitation, trace element, Sr isotope, Pb isotope
Throughout a year, the concentrations of Ni, U, Pb, Cs, Sr, Li, Rb, V, Sb, Al, Mn, and Co in the precipitation of the city office site were 1.3 to 3.0 times higher than those in the precipitation at the Jojusha site. For Ga, As, W, Cd, Zn, Ba, Si, and Mo, the enrichment in the city office precipitation were 3.7 to 6.5 times and the enrichment in the city office precipitation were 17 times for Cu. The increase of dissolved elements in the winter precipitation is likely ascribed to the long-range transport from the Asian continent. However, the enrichment of elements in the precipitation at the city office suggests their major source to be the urban area in the Saijo city and/or surrounding Setouchi region. This contention is consistent with the Pb isotope ratios of precipitation at Jojusha, which are indistinguishable from those in aerozols in Japan.