9:00 AM - 10:30 AM
[AAS07-P16] Size distribution of atmospheric aerosols and contribution from anthropogenic sources in remote and urban sites
Keywords:PM2.5, size distribution, remote, urban site
It is known that atmospheric aerosols are caused to various health effects such as argentic ashma, lung cancer after taking into the human body. It is thought that aerosols composed with different chemical species cause to different influence to human health, because the chemical composition and size distribution largely fluctuated by variation of emission, physical processes, and chemical reactions in the atmosphere.
In this study, size distribution of chemical species in atmospheric aerosols were investigated in Fukue and Kawasaki sites in order to investigate the influence of human health. Fukue is located to the western part of the Japanese island and is influence the transboundary transport of atmospheric gases and aerosols from Northeast Asia. Kawasaki is mega population city with active industry region. The sampling of atmospheric aerosols was conducted in April and May, 2022. Water soluble ion species (Na+, NH4+, K+, Mg2+, Ca2+, Cl-, NO3-, SO42-) and heavy metals (acid dissolved and water soluble species; Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Cd, Pb, Ga, Se, Rb, Sr, Cs, Ba, Bi) were analyzed for each size fractions. The dominant species of acid dissolved heavy metal was Al, Fe, Cr, Mn, Ni, Zn, Cu. Water soluble heavy metals, which considered as intake the human body, were mainly consisted in Fe, Al, Zn, and Mn. In acid dissolved fraction and water soluble fractions for each size, concentrations of heavy metals were 2.7-8.8 times larger in Kawasaki than those in Fukue. Heavy metals largely existed in the fraction of PM2.5-10 and PM>10, which consistent with 45-60 % for water soluble heavy metal and 70-78 % for acid dissolved trace metal. Existence of acid dissolved and water soluble trace metals in nanoparticles (< 100 nm) against the total metals were almost 3% and 2-5%, respectively. Contribution from transboundary transported minerals was large in coarse particles, PM2.5-10 and PM>10. Based on the relationships between nssSO42- and heavy metals, the heavy metals existed in nanoparticles were originated from domestic anthropogenic sources.
In this study, size distribution of chemical species in atmospheric aerosols were investigated in Fukue and Kawasaki sites in order to investigate the influence of human health. Fukue is located to the western part of the Japanese island and is influence the transboundary transport of atmospheric gases and aerosols from Northeast Asia. Kawasaki is mega population city with active industry region. The sampling of atmospheric aerosols was conducted in April and May, 2022. Water soluble ion species (Na+, NH4+, K+, Mg2+, Ca2+, Cl-, NO3-, SO42-) and heavy metals (acid dissolved and water soluble species; Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Cd, Pb, Ga, Se, Rb, Sr, Cs, Ba, Bi) were analyzed for each size fractions. The dominant species of acid dissolved heavy metal was Al, Fe, Cr, Mn, Ni, Zn, Cu. Water soluble heavy metals, which considered as intake the human body, were mainly consisted in Fe, Al, Zn, and Mn. In acid dissolved fraction and water soluble fractions for each size, concentrations of heavy metals were 2.7-8.8 times larger in Kawasaki than those in Fukue. Heavy metals largely existed in the fraction of PM2.5-10 and PM>10, which consistent with 45-60 % for water soluble heavy metal and 70-78 % for acid dissolved trace metal. Existence of acid dissolved and water soluble trace metals in nanoparticles (< 100 nm) against the total metals were almost 3% and 2-5%, respectively. Contribution from transboundary transported minerals was large in coarse particles, PM2.5-10 and PM>10. Based on the relationships between nssSO42- and heavy metals, the heavy metals existed in nanoparticles were originated from domestic anthropogenic sources.