PM2.5 and PM10-2.5 chemical composition and source apportionment near a Hong Kong roadway
PM2.5 and PM10-2.5 chemical composition and source apportionment near a Hong Kong roadway
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香港道路附近的 PM2.5 和 PM10-2.5 化学成分及来源解析
DOI：
10.1016/j.partic.2013.10.003
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发表时间：
2015-02-01
期刊：
影响因子：
3.5
通讯作者：
Zhang, Renjian
中科院分区：
文献类型：
--
作者：
Cheng, Yan;Lee, Shuncheng;Zhang, Renjian
2004年10月至2005年9月期间，每隔6天在香港一个交通繁忙的路边站点同时收集24小时PM2.5和PlVlio样本。测定了PM2.5、PM10-2.5（定义为PM10 - PM2.5）、有机碳（OC）、元素碳（EC）、水溶性离子和多达25种元素的质量浓度。化学成分和潜在来源的调查显示，PM2.5和PM10-2.5之间存在明显差异。PM2.5和PM10-2.5的年平均质量浓度分别为55.5 25.5和25.9 15.7 pg/m（3）。EC、OM（OM = OC x 1.4）和硫酸铵占PM2.5的82%以上，分别占PM2.5质量的29%、27%和25%。PM2.5的低OC/EC比（小于1）表明，新鲜柴油发动机排气是主要贡献者。正矩阵分解（PMF）模型对PM2.5的7个来源进行了解析，其中包括机动车尾气（与29%相似），二次无机气溶胶（类似于27%），废物焚烧炉/生物质燃烧（与23%相似），残油燃烧（近似10%），海洋气溶胶（近似6%），工业废气（近似4%）和再悬浮的道路灰尘（近似1%）。EC和OM仅占PM10-2.5的19%。的平均OC/EC比PM10-2.5为7.8 - 14.2，这表明，车辆尾气以外的来源是重要的贡献者。PM10-2.5的来源由PMF模型确定的包括20%的交通产生的再悬浮（例如，轮胎灰尘/刹车线/汽油蒸发），17%的本地再悬浮道路灰尘，17%的海洋气溶胶，12%的二次气溶胶/现场燃烧，和11%的车辆排放。(C)2013由Elsevier B. V.代表中国科学院颗粒学会和过程工程研究所出版。
Twenty-four-hour PM2.5 and PlVlio samples were collected simultaneously at a highly trafficked roadside site in Hong Kong every sixth day from October 2004 to September 2005. The mass concentrations of PM2.5, PM10-2.5 (defined as PM10 - PM2.5), organic carbon (OC), elemental carbon (EC), water-soluble ions, and up to 25 elements were determined. Investigation of the chemical compositions and potential sources revealed distinct differences between PM2.5 and PM10-2.5. The annual average mass concentrations were 55.5 25.5 and 25.9 15.7 pg/m(3) for PM2.5 and PM10-2.5, respectively. EC, OM (OM = OC x 1.4), and ammonium sulfate comprised over 82% of PM2.5, accounting for 29%, 27%, and 25%, respectively, of the PM2.5 mass. Low OC/EC ratios (less than 1) for PM2.5 suggested that fresh diesel-engine exhaust was a major contributor. Seven sources were resolved for PM2.5 by positive matrix factorization (PMF) model, including vehicle emissions (similar to 29%), secondary inorganic aerosols (similar to 27%), waste incinerator/biomass burning (similar to 23%), residual oil combustion (similar to 10%), marine aerosols (similar to 6%), industrial exhaust (similar to 4%), and resuspended road dust (similar to 1%). EC and OM comprised only 19% of PM10-2.5. The average OC/EC ratio of PM10-2.5 was 7.8 14.2, suggesting that sources other than vehicular exhaust were important contributors. The sources for PM10-2.5. determined by the PMF model included 20% traffic-generated resuspension (e.g., tire dust/brake linear/petrol evaporation), 17% locally resuspended road dust, 17% marine aerosols, 12% secondary aerosols/field burning, and 11% vehicle emissions. (C) 2013 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.