居室玻璃表面有机质与多环芳烃分布规律研究

为探讨广州和香港市区玻璃表面薄膜上有机质和PAHs的分布特征,从2007年12月至2008年1月,利用低尘擦拭纸采集广州和香港室内外相对应的15对玻璃表面薄膜样品.结果表明,广州室内外有机质占表面薄膜重量的1.8%和1.1%,香港则分别为3.9%和1.6%.玻璃表面薄膜上Σ15PAHs浓度的最高值达到1430ng/m2,以菲,芴,荧蒽,芘等为主.室内外对比结果显示,主要以颗粒态形式存在的5~6环化合物室内外差别较大,广州室外比室内大约高1倍,而香港由于中央通风系统的过滤作用,其室外比室内高约5~10倍.根据有机质和PAHs浓度之间的相关性,认为室内外存在不同源强的有机质和PAHs来源,玻璃表面可能更有利于PAHs的光降解.

Concentration and distribution of organic matter and polycyclic aromatic hydrocarbons (PAHs) on window glass surface

In order to investigate the distribution of organic matter and polycyclic aromatic hydrocarbons (PAHs) in organic film of window glass surfaces, samples of indoor and outdoor were collected in pairs with cleaned Kimwipes paper from untinted windows at 6 sites in the urban area of Guangzhou, and 9 sites in Hong Kong, respectively, between Dec, 2007 and Jan, 2008. High levels of organic matter were observed on the window surfaces in the two cities, but ratios of organic matter to total glass film masses were relatively low. The average value was 1.8% and 1.1% for interior and exterior windows at Guangzhou, and 3.9% and 1.6% for interior and exterior windows at Hong Kong, respectively. The highest concentration of total PAHs in the glass films was found to be 1430 ng/m2, which was dominated by phenanthrene, fluorene, fluoranthene, and pyrene. High molecular weight PAHs mostly in particulate phase were significant high in exterior films. The concentrations of 5~6 ring PAHs were about one fold higher in the exterior films than in the interior films at Guangzhou, whereas about 5 to 10 fold higher at Hong Kong. The analysis of correlation between organic matter and PAHs indicated that sources of organic matter and PAHs in indoor and outdoor environment were different from each other. The residence on window surface would be beneficial to photodegradation of PAHs.