Chemical characteristics of PM₁₀ during the summer in the mega-city Guangzhou, China

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• 作者：Tingting Han ; Xingang Liu ; Yuanhang Zhang ; Jianwei Gu ; Hezhong Tian ; Limin Zeng ; Shih-Yu Chang ; Yafang Cheng ; Keding Lu ; Min Hu
• 关键词：Particulate matter ; Water-soluble inorganic ions ; Organic carbon ; Elemental carbon ; Guangzhou
• 刊名：Atmospheric Research
• 出版年：February, 2014
• 年：2014
• 卷：137
• 期：Complete
• 页码：25-34
• 全文大小：1247 K

文摘

With rapid economic development and the acceleration of urbanization, air pollution has become a serious problem in the mega-city Guangzhou, China. A field campaign to sample and analyze particulate matter (PM) chemical components was performed from July 6, 2006 to July 26, 2006, in Guangzhou. During the campaign, the average mass concentration of PM₁₀ was 89.0 卤 46.6 渭g m^鈭?#xA0;3 (the error represents one standard deviation). The PM₁₀, sulfate, nitrate, ammonium, organic carbon (OC), and elemental carbon (EC) mass frequency distributions were analyzed. The [NO₃^{鈭?/sup>]/[SO₄2 鈭?/sup>] mass ratio varied from 0.1 to 0.3, with an average of 0.2. A Pearson correlation analysis between [SO₄2 鈭?/sup>] and [NH₄+] and between [NO₃鈭?/sup>] and [Na+] showed that SO₄2 鈭?/sup> existed as (NH₄)₂SO₄ and NO₃ 鈭?/sup> existed as NH₄NO₃ and NaNO₃. Sulfate, nitrate, ammonium, EC and POM (particulate organic matter) accounted for 24.4%, 4.9%, 5.7%, 5.7% and 21.0%, respectively, of the PM₁₀ mass concentration during clean days and 25.7%, 3.9%, 7.9%, 5.4% and 20.8%, respectively, on hazy days. Among these species, SNA (sulfate, nitrate, and ammonium) were the most abundant, accounting for 35.0% and 37.5% of the PM₁₀ during clean and hazy days, respectively. The sum of POM and EC accounted for 26.7% and 26.2% of PM₁₀ in Guangzhou during clean and hazy days, respectively. There was no apparent difference in the chemical composition of PM₁₀ between clean and haze days.}