[Characteristics and sources of PM10-bound PAHs during haze period in winter-spring of Xiamen].

PM10 samples were collected at Huli (industrial zone) and Dadeng Island in Xiamen from December 2008 to March 2009. Nineteen polycyclic aromatic hydrocarbons (PAHs) during haze and non-haze periods were determined by GC/MS. Combined with the meteorological data, the differences of chemical composition and source of PAHs were compared. During sampling periods, the concentrations of PM10-bound PAHs ranged from 12.93 to 79.27 ng x m(-3) with the average of 42.28 ng x m(-3), which were almost three times higher than those in the winter of 2004. PAHs concentrations were much higher during the haze periods than those in the non-haze periods. Meanwhile, during the haze periods the percentages of lower molecular weight PAHs such as Phe, Fluo and Pyr decreased significantly, on the contrary, individual components of BbF, BkF, BaP, Per, Icdp, BghiP and COR were more abundant. The main sources of PAHs were estimated by the Principal Component Analysis method and the contributions of various pollution sources to PAHs were calculated by the Multiple Linear Regression method. Results showed that the main pollutant sources of PM10-bound PAHs in winter-spring of Xiamen during the haze period were vehicle emission plus natural gas, coal combustion and coke oven, their contribution rates were 62.7%, 28.1% and 9.2%, respectively. During non-haze periods, the main pollutant sources identified were the same and the contribution rates were 48.6%, 36.9% and 14.5%, respectively. In winter-spring of Xiamen, PM10-bound PAHs were more influenced by local emission sources during the haze periods; coal combustion emissions in north China had a big contribution to PAHs during the non-haze periods.