Multimedia fate modeling of PAHs in Guangdong,Hong Kong,and Macao

A level III fugacity model was conducted to estimate the fate of PAHs in Guangdong,Hong Kong,and Macao under a steady-state assumption.Concentrations in various media and transfer fluxes between the media were predicted.The results were validated by comparison between the predicted and the measured concentrations of PAHs in the bulk media of the area.With exceptions of a few numbers,the differences between them were less than one order of magnitude with most of them below 0.5 log-units.It was demonstrated that the major source of PAHs in the area is combustion of fossil fuel and degradation in air and soil are the major route of disappearance.Air-surface transfer are the most important processes among many inter-media transfers.