Urban roadside aromatic hydrocarbons in three cities of the Pearl River Delta,People's Republic of China |
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Institution: | 1. Faculty of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), P.O. Box 15875-4413, Hafez Ave, Tehran, Iran;2. Petroleum Refining Division, Research Institute of Petroleum Industry, P.O. Box 1485733111, Tehran, Iran;1. Mathematical and Physical Department, Universita'' del Salento, 73100 Lecce, Italy;2. SCOLAb, Física Aplicada, Universidad Miguel Hernandez, 03202 Elche, Spain |
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Abstract: | Urban roadside levels of benzene, toluene, ethylbenzene and xylenes (BTEX) were investigated in three typical cities (Guangzhou, Macau and Nanhai) in the Pearl River Delta Region of south China. Air samples were collected at typical ground level microenvironments by multi-bed adsorbent tubes. The BTEX concentrations were determined by thermal desorption–gas chromatography–mass selective detector (TD–GC–MSD) technique. The mean concentrations of benzene, toluene, ethylbenzene and xylenes were, respectively, 51.5, 77.3, 17.8 and 81.6 μg/m3 in Guangzhou, 34.9, 85.9, 24.1, 95.6 μg/m3 in Macau, and 20.0, 39.1, 3.0 and 14.2 μg/m3 in Nanhai. The relative concentration distribution pattern and mutual correlation analysis indicated that in Macau BTEX were predominantly traffic-related while in Guangzhou benzene had sources other than vehicle emission. In Nanhai, both benzene and toluene had different sources other than vehicle emission. The samples collected from Guangzhou showed that BTEX had significant higher concentrations in November than those in July. |
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