会议专题

Diurnal Variation of Chemical Composition in Ultrafine and Fine Particles in Urban Area

Atmospheric ultrafine particles (UFPs; Dp < 0.1 μm) and fine particles (FPs; Dp < 2.5 μm) are simultaneously collected for 23 h (1 day) and 11.5 h (daytime and nighttime) respectively in November when the contribution of biomass burning increases to observe characteristics of chemical composition in FPs in comparison with those collected for 23 h in UFPs. Contribution of biomass burning in FPs was found to be significant during the sampling periods especially in nighttime. Levoglucosan in UFPs was measure for the first time with that in FPs. The observed concentrations of levoglucosan in UFPs and FPs are highly correlated (r2 = 0.92, n = 10, p < 0.001) indicating that the observed levoglucosan in the two particle sizes had been originated from local biomass burnings close to the sampling sites. The simultaneous measurement of UFPs and FPs enabled us to find the emission sources (local or regional) in the study area. Negative correlation between organic carbon (OC) and soot-elemental carbon (EC) was observed for FPs collected at roadside while positive correlation between OC and soot-EC was observed for FPs collected at background site indicating different characteristics of carbonaceous components for different environment.

Ultrafine particles Fine particles Chemical composition Levoglucosan Biomass burning

Kyung Hwan Kim Takayoshi Okamoto Shimpei Sato Ortiz Ricardo Kazuhiko Sekiguchi Satoru Chatani Tazuko Morikawa Hiroaki Minoura Kazuhiko Sakamoto

Graduate School of Science and Engineering,Saitama University,255 Shimo-Okubo,Sakura,Saitama,338-857 Graduate School of Science and Engineering,Saitama University,255 Shimo-Okubo,Sakura,Saitama,338-857 Japan Petroleum Energy Center,4-3-9,Toranomon,Minato-ku,Tokyo,105-0001,Japan Graduate School of Science and Engineering,Saitama University,255 Shimo-Okubo,Sakura,Saitama,338-857

国际会议

第七届亚洲气溶胶会议

西安

英文

676-683

2011-08-17(万方平台首次上网日期,不代表论文的发表时间)