南京市气溶胶PM2.5一次来源解析

在南京大学鼓楼校区（市区）和南京信息工程大学（郊区）校园，分季采集PM2.5及其主要排放源的颗粒样品，在南京大学现代分析测试中心用X-荧光分析法分析样品中的化学元素，应用化学元素平衡法（CMB）计算了各主要源对PM2.5的贡献。结果表明对市区扬尘和建筑尘是PM2．5最主要的贡献源，贡献率合计约70％；燃煤尘和冶炼尘仅为约15％。对郊区扬尘和煤烟尘是PM2．5的最主要贡献源，平均贡献率分别为50％和22．4％，建筑尘的平均贡献率为8．3％，冶炼尘的贡献小于8％。这些结果可为治理气溶胶细颗粒源提供决策依据。

A SOURCES APPORTIONMENT OF AEROSOLS PM2.5 OVER THE URBAN AND SUBURB AREAS OF NANJING

Sampled in a central urban and a suburb area of Nanjing on a seasonal basis were PM_(2.5) particles away from and directly at the principal discharging sources,of which chemical compositions were analyzed by means of X-ray fluorescence and the contributions of sources to PM_(2.5) pollutants calculated by the Chemical Mass Balance(CMB) model.Evidence suggests that maximum sources responsible for the species were dust and those from construction sites in the city,with their contributions of some 70% of total and those of metallurgy and coal burning reaching 15% only whereas the maximum sources of pollutants were dusts and particles from burning coal in the northern suburb where contribution of burned coal particles exceeds that of construction dusts but ranks next to that of dusts,with dusts from metallurgical origin less than 8% in contribution.These findings provide a policy-making basis for bringing the PM_(2.5) sources under control in the urban-suburb development.