镇江市冬季PM_(2.5)的来源解析

Study on the Sources of PM_(2. 5) in Winter in Zhenjiang

采集了镇江环境监测站1月份的PM2.5样品,用SPAMS 0515对PM2.5来源进行解析,结果显示,对镇江市区冬季环境空气有明显贡献的颗粒物来源是汽车尾气、燃煤、工业排放和扬尘,4者的贡献率分别为汽车尾气占22.5%、燃煤占16.3%、工业源占13.6%、扬尘占11.8%。镇江市区冬季PM2.5颗粒中,汽车尾气、燃煤分布在小粒径段,扬尘分布在大粒径段。日间汽车尾气和扬尘对PM2.5增高的影响增大,早高峰、晚高峰汽车尾气贡献增长。PM2.5中含的Mn、Fe、Cr、Zn、Pb 5种金属元素颗粒中含Pb颗粒数量最大。

Air was sampled in January in Zhenjiang.The Single Particle Aerosol Mass Spectrometer （SPAMS0515） was applied to examine the sources of PM2.5 .The results showed that the sources of PM2.5 were from tail gas,coal-burning,discharge from the industry,and dust.Their contribution rates were 22.5%,16.3%,13.6%,and 1 1.8% respectively.PM2.5 from tail gas and coal burning form the smaller particles.However,dusts become big-ger particles.The increase of PM2.5 in the day time was correlated closely to tail gas and dust,especially in the rus-hing hours in the morning and in the afternoon.Five heavy metals （Mn,Fe,Cr,Zn,and Pb）were found on PM2.5 particles.The particles with the most of Pb absorbed have the biggest size.