The aqueous concentrations in this study are similar to those of the neverless previous investigations if Nap is excluded (13.64�C106.85ng/L). On the other hand, PAHs in this investigation were several times higher than those found in Beltic Sea (3.85�C14.1ng/L) and in the North Sea (0.63�C3.51ng/L) [21]. Similar concentrations were found in Xijiang River, China (21.7�C138ng/L) [5], Pearl River Delta (10.8�C323ng/L) [14], and Chesapeake Bay, USA (20�C65.7ng/L) [22]. Table 3Summary of total PAHs concentration (ng/L) in water and SPM from different sites around the world.3.2.2. PAHs in SPM PAHs in SPM presented in Figure 4 also showed seasonal variation like PAHs of the water samples in the Dongjiang River. The total PAHs concentrations varied from 30.14 to 360.14ng/L with an average of 131.

5ng/L and a standard deviation of 124.8ng/L in summer and from 53.45 to 114.9ng/g with an average of 85.77ng/g and a standard deviation of 20.68ng/L in spring. In the Pearl River, particulate PAHs were in a range of 80.8 to 229.2ng/L with an average of 158.24ng/L and a standard deviation of 59.4ng/L. It was found that PAHs in SPM was higher in Pearl River than in Dongjiang River in spring.Like the water samples, low molecular weight PAHs in SPM were also the dominant compounds. However, PAHs in this study are at different levels compared with the previous investigation in other areas. PAHs in SPM in this study were 2 orders of magnitude higher than those of the particulate samples collected from other regions (Table 3), such as the Xijiang River (0.17�C58.

2ng/L) [5] and six to seven times higher than York River of the VA Estuary (2.09�C123ng/L) [23]. They are at similar level to the concentrations of PAHs in Pearl River and the Macao Harbor, China (150�C431ng/L) [20] and the Seine River and Estuary, France (2�C687ng/L) [24].3.2.3. PAHs in the Fish Species Figure 6 shows the tissue distribution of PAHs and lipid contents in different fish species. Different levels of total PAHs in fish species were found. The highest concentration of PAHs was detected in red grass carp, ranging from 46.85 to 236.14ng/g dw. It was approximately 2 to 3 times higher than other fishes. And the lowest PAHs levels occurred in tilapia (collected in summer), ranging from 14.70 to 80.51ng/g dry weight. However, there were no significant differences among the other fish species. In terms of the individual PAHs, low molecular weight PAHs were the major compounds in the fish species, which are similar to those of the water and SPM samples. Compared with PAHs in the muscle (184�C194ng/g dw) Brefeldin_A and viscera tissues (505�C854ng/g dw) in different sized tilapia reported for Mai Po Marshes by Liang et al. [7], PAHs here both in muscle (14.