さいたま市における初冬季の微小粒子中のレボグルコサンと炭素成分

抄録

Carbonaceous components in fine particles less than 2.5μm in diameter (PM_2.5) in urban areas are of great concern because of health effects and environmental impact. In this study, water-soluble inorganic ions, organic carbon (OC) , elemental carbon (EC) , and levoglucosan emitted from biomass burning were measured in the fine particle (PM_2.5) during the early winter at Saitama. The most abundant component of PM_2.5 was organics (or OC) , followed by EC, NO₃^- and SO₄^2-. Levoglucosan showed high concentrations in the sampling period which ranged from 139 to 2,900 ng/m³ (average 1,140 ng/m³) as 12h average and accounted for 1∼5.4% (average 4%) of OC and 0.2∼3.3% (average 1.9%) of total carbon (TC) . Science levoglucosan occupied a large portion of TC in particles though was a single organic compound, we estimated that the TC concentration observed in this study was associated with large contribution by the biomass burning.