广州市天河区某小学PM_(2.5)的化学组成分析

Chemical Characteristics of PM_(2.5) at a Primary School in Tianhe District of Guangzhou

为了解广州市天河区某小学大气环境中细粒子（PM2.5）的污染水平和组分特征，采用便携式PM2.5采样器（MiniVol）在2010年3月25日-4月1日对该小学室外PM2.5浓度进行了监测，并通过离子色谱仪、碳分析仪、X射线荧光分析仪（XRF）分析PM2，的化学组成。结果表明该采样点室外PM2s浓度范围为25．1-145．9μg／m3，PML5的主要离子成分是S04^（2-）、N03-、NH4＋，含碳组分浓度不高，S、K、Cl、Na、A1、Si、Fe、Mg、Ca、Zn等元素对PM25浓度有一定贡献。该采样点PM2．5主要来源于煤燃烧源、生物质燃烧源、海洋源、本地交通源、土壤尘和建筑尘。

The paper described the fine particles （PM2.s） concentration and composition in the ambient of a primary school in Tianhe district of Guangzhou. Outdoor PM25 samples were collected from 2010-03-25 to 2010-04-01 by atmospheric particle samplers（MiniVol）, and chemical composition of the samples were analyzed. The outdoor daily averages of PM2.5 ranged from 25.1 to 145.9 μg/m3. The principal ionic components were SO42^（2-）, NO3-and NH4＋.The concentration of carbonaceous species were low. The elements S, K, Cl, Na, A1, Si, Fe, Mg, Ca and Zn made a contribution to PM25 concentration. The results showed that the main sources of PM2.5 at the sampling site were Coal combustion, biomass burning, marine emission, vehicle emissiort, soil dusts and cement dusts.