Molecular, seasonal, and spatial distributions of organic aerosols from fourteen Chinese cities.
Molecular, seasonal, and spatial distributions of organic aerosols from fourteen Chinese cities.
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DOI：
10.1021/es060291x
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发表时间：
2006-08
影响因子：
11.4
通讯作者：
Gehui Wang;K. Kawamura;Shun-cheng Lee;K. Ho;Junji Cao
中科院分区：
文献类型：
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作者：
Gehui Wang;K. Kawamura;Shun-cheng Lee;K. Ho;Junji Cao
2003年冬夏，对中国14个沿海和内陆特大城市的有机气溶胶进行了分子水平的研究。它们的特点是大量存在正构烷烃（年平均340 ng m(-3)）、脂肪酸（769 ng m(-3)）、糖（412 ng m(-3)）和邻苯二甲酸盐（387 ng m(-3)）。相比之下，脂肪醇、多元醇/聚酸、木质素和树脂产物、甾醇、多环芳烃（PAHs）和藿烷是相对次要的成分。正构烷烃表现出微弱的奇/偶碳优势（CPI = 1.1），多环芳烃表现出苯并(b)荧光蒽的优势，表明化石燃料（主要是煤）燃烧对其贡献很大。它们的浓度（邻苯二甲酸酯和多元醇/多元酸除外）在冬季比夏季高2-15倍，这是由于大量使用燃煤和大气逆温层的增强。发现邻苯二甲酸盐在夏季比冬季更丰富，可能是由于塑料的气化增强，随后吸附沉积在原有颗粒上。中西部地区（重庆和西安）工业化/城市化发展活跃，总定量化合物浓度极高（约为10微克（-3））。这项研究表明，检测到的化合物浓度比发达国家报告的浓度高1-3个数量级。
Organic aerosols were studied at the molecular level in 14 coastal and inland mega-cities in China during winter and summer 2003. They are characterized by the abundant presence of n-alkanes (annual average, 340 ng m(-3)), fatty acids (769 ng m(-3)), sugars (412 ng m(-3)), and phthalates (387 ng m(-3)). In contrast, fatty alcohols, polyols/polyacids, lignin and resin products, sterols, polycyclic aromatic hydrocarbons (PAHs), and hopanes were detected as relatively minor components. n-Alkanes show a weak odd/even carbon predominance (CPI = 1.1) and PAHs show a predominance of benzo(b)fluoranthene, suggesting a serious contribution from fossil fuel (mainly coal) combustion. Their concentrations (except for phthalates and polyols/polyacids) were 2-15 times higher in winter than summer due to a significant usage of coal burning and an enhancement of atmospheric inversion layers. Phthalates were found to be more abundant in summer than winter, probably due to enhanced vaporization from plastics followed by adsorptive deposition on the pre-existing particles. Concentrations of total quantified compounds are extremely high (approximately 10 microg m(-3)) in the midwest (Chongqing and Xi'an) where active industrialization/urbanization is going on. This study shows that concentrations of the compounds detected are 1-3 orders of magnitude higher than those reported from developed countries.