[Distribution characteristics of polycyclic aromatic hydrocarbons and black carbon in road dusts from typical cities of China and India].

In order to investigate the distribution characteristics of polycyclic aromatic hydrocarbons (PAHs) and black carbon (BC) in road dusts in typical cities of Beijing, Shanghai, Guangzhou and Wuhan in China and Kolcata in India, samples were collected in urban roads during Dec., 2007 to Feb., 2009. The total 16 PAHs concentrations in metro cities from China were 2.30-22.2 microg x g(-1), which was dominated by FLA, PHE, PYR, CHR, BBF and BGP. PAHs contents were in the range of 4.85-30.5 microg x g(-1) in Kolcata from India, which was dominated by NAP. Higher levels of BC in Chinese cities than India city were likely due to different power structures and consumes. The correlation between PAHs and BC showed different characteristics in different city, which might be reflected diverse sources. Diagnostic ratios demonstrated that the main source of PAHs was from the emission of vehicle, and coal combustion is another possible source.

Polycyclic aromatic hydrocarbons on indoor/outdoor glass window surfaces in Guangzhou and Hong Kong, south China.

Organic films were collected from indoor and outdoor window surfaces in two large cities in southern China, Guangzhou and Hong Kong, and analyzed to quantify the polycyclic aromatic hydrocarbons (PAHs). In the glass films, the highest concentration of total PAHs, predominantly phenanthrene, fluorene, fluoranthene, and pyrene, was found to be l400 ng/m(2). The concentrations of PAHs in Guangzhou were usually higher than those in Hong Kong. In general, higher concentrations of PAHs on exterior window films in comparison with interior window films in both cities indicated that the outdoor air acted as a major source of pollution to the indoor environment. However, indoor air was a major source of some light-weight PAHs. Measurements made over time indicated that the growth rates of light-weight PAHs on window surfaces were fast at the beginning and then gradually reached a consistent level, whereas heavy-weight PAHs exhibited near-linear accumulation during the 40 days sampling period.