Liu Xiang, Zhang Gan, Li Jun, Cheng Hai-Rong, Qi Shi-Hua, Li Xiang-Dong, Jones Kevin C
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academic of Science, Guangzhou, 510640, China.
J Environ Monit. 2007 Oct;9(10):1092-8. doi: 10.1039/b707977j. Epub 2007 Aug 2.
Polycyclic aromatic hydrocarbons (PAHs) were determined in the air of 37 cities and 3 rural locations across China during the winter, spring, summer and autumn of 2005, using polyurethane foam (PUF) disks as passive air samplers (PAS). Winter and autumn concentrations in cities exceeded spring and summer values. Concentrations were amongst the highest in the world; seasonally averaged autumn/winter values in some cities in the north and north-west of China exceeded proposed European Union air quality standards. Several factors, acting in combination, influenced air concentrations. A significant negative correlation was found between average annual city concentrations and the annual average temperature, while winter time PAH concentrations correlated with estimated coal consumption. The highest total PAH concentrations and loadings of high molecular weight compounds generally occurred in major cities located on higher land (500-2000 m), where relatively cold winters and higher coal consumption occurs. Lower values occurred in cities located in the south and east China and along the coastal regions. Molecular markers indicated incomplete combustion of fossil fuels dominated the urban air and gave evidence for photo-decomposition of selected compounds.
2005年冬、春、夏、秋四季，在中国37个城市和3个农村地区的空气中测定了多环芳烃（PAHs），采用聚氨酯泡沫（PUF）盘作为被动空气采样器（PAS）。城市中的冬季和秋季浓度超过了春季和夏季的值。这些浓度处于世界最高水平之列；中国北方和西北部一些城市的季节性平均秋冬值超过了欧盟提议的空气质量标准。多种因素共同作用影响着空气浓度。发现城市年均浓度与年平均温度之间存在显著的负相关，而冬季PAH浓度与估计的煤炭消耗量相关。高分子量化合物的总PAH浓度和负荷最高值通常出现在地势较高（500 - 2000米）的主要城市，这些城市冬季相对寒冷且煤炭消耗量较高。较低的值出现在中国南部、东部以及沿海地区的城市。分子标志物表明化石燃料的不完全燃烧在城市空气中占主导地位，并为某些化合物的光分解提供了证据。
