Zhu Li-Hua, Tao Jun, Chen Zhong-Ming, Zhao Yue, Zhang Ren-Jian, Cao Jun-Ji
South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China.
Huan Jing Ke Xue. 2012 Jan;33(1):13-9.
Aerosol samples for PM2.5 were collected from 1st January to 31st January 2010, in Beijing. The concentrations of organic carbon, elemental carbon, water-solubile ions and soil elements of all particle samples were determined by thermal/optical carbon analyzer, ion chromatography and X-ray fluorescence spectrometer, respectively. The scattering coefficients (b(sp)), absorbing coefficients (b(ap)) and meteorological parameters for this period were also measured. Ambient light extinction coefficients were reconstructed by IMPROVE formula and were compared with measured light extinction coefficients. The results showed that the average mass concentration of PM2.5 was (144.3 +/- 89.1) microg x m(-3) during campaigning period. The average values of measured b(ap), b(sp) and extinction coefficient (b(ext)) were (67.4 +/- 54.3), (328.5 +/- 353.8) and (395.9 +/- 405.2) Mm(-1), respectively. IMPROVE formula is suitable for source apportionment of light extinction coefficient in campaign period. The average value of calculated b'(ext) was (611 +/- 503) Mm(-1) in January, 2010. The major contributors to ambient light extinction coefficients included (NH4) 2SO4 (24.6%), NH4NO3 (11.6%), OM (45.5%), EC (11.9%) and FS (6.4%), respectively.
2010年1月1日至1月31日期间，在北京采集了PM2.5的气溶胶样本。所有颗粒样本的有机碳、元素碳、水溶性离子和土壤元素浓度分别通过热/光碳分析仪、离子色谱仪和X射线荧光光谱仪测定。还测量了该时期的散射系数（b(sp)）、吸收系数（b(ap)）和气象参数。通过IMPROVE公式重建了环境光消光系数，并与实测光消光系数进行了比较。结果表明，活动期间PM2.5的平均质量浓度为(144.3±89.1)μg×m(-3)。实测b(ap)、b(sp)和消光系数（b(ext)）的平均值分别为(67.4±54.3)、(328.5±353.8)和(395.9±405.2)Mm(-1)。IMPROVE公式适用于活动期间光消光系数的源解析。2010年1月计算出的b'(ext)平均值为(611±503)Mm(-1)。环境光消光系数的主要贡献者分别为(NH4)2SO4（24.6%）、NH4NO3（11.6%）、OM（45.5%）、EC（11.9%）和FS（6.4%）。
