沈阳市大气中PM2.5来源解析研究

Study on Source Apportionment of PM2.5 in Ambient Air of Shenyang

通过2015年在沈阳市采集PM2.5样品及源类样品,分析样品的质量浓度和化学组成,用化学质量平衡(CMB)模型对该市PM2.5来源进行解析。结果表明:沈阳市大气中PM2.5浓度时空变化特征明显;各主要源类对沈阳市PM2.5的分担率依次为煤烟尘(28.03%)、二次无机离子(22.63%)、机动车尾气尘(17.27%)、城市扬尘(13.28%)、建筑尘(5.94%)、土壤风沙尘(5.82%)、道路尘(3.04%)、生物质燃烧尘(2.74%)和冶金尘(1.25%)。燃煤和机动车的有效控制既能降低本类源的贡献,也能降低二次无机离子,体现了多源类综合治理原则。

The mass concentration and the chemical composition of PM2.5 and its source samples collected in Shenyang in 2015 were analyzed,the source apportionment of PM2.5 was researched by chemical mass balance(CMB)model.The results showed that the temporal and spatial variation were obvious.The share ratios of the major sources were coal combustion(28.03%),secondary inorganic ions(22.63%),motor vehicle exhaust(17.27%),urban fugitive dust(13.28%),construction dust(5.94%),soil dust(5.82%),traffic dust(3.04%),biomass combustion dust(2.74%)and smelting dust(1.25%),in turn.The effective control of coal combustion and motor vehicles could both reduce the contribution of these sources and secondary inorganic ions.This reflected the principle of multi-source comprehensive management.