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Toxic equivalency factors of BaP (BaPeq) (Nisbet & Lagoy 1992) were used to assess the environmental risks of water PAH in urban areas of Nanjing (Table 3). Figure 5 shows the BaPeq values ranged from 23.15 to 218.01 ng/L. The result indicated that 100% of BaPeq values were higher than the Chinese National Standard (State General Administration of the People's Republic of China for Quality Supervision and Inspection and Quarantine, State Environmental Protection Administration of China 2002) which specifies that a safe value for BaP in surface water is 2.8 ng/L. The results show that the surface water in urban areas of Nanjing was heavily polluted and may cause potential health risks. Therefore, efforts should be taken to control the PAH emissions and to effectively treat the fossil fuel use in traffic and industrial processes to reduce the PAH environmental concentrations.
Table 3

Toxicity equivalency factors for individual PAHs in urban area surface water, Nanjing, China

Nap Acy Ace Fl Phe Ant Flu Pyr 
0.001 0.001 0.001 0.001 0.001 0.01 0.001 0.001 
BaA Chr BbF BkF BaP InP DBA BP 
0.1 0.01 0.1 0.1 0.1 0.01 
Nap Acy Ace Fl Phe Ant Flu Pyr 
0.001 0.001 0.001 0.001 0.001 0.01 0.001 0.001 
BaA Chr BbF BkF BaP InP DBA BP 
0.1 0.01 0.1 0.1 0.1 0.01 
Figure 5

BaPeq values in the surface water samples in urban areas of Nanjing, China.

Figure 5

BaPeq values in the surface water samples in urban areas of Nanjing, China.

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