Distribution of PAEs in pollutant source (ng/L). Polychlorinated biphenyls (PCBs). The distribution of PCBs in natural water is shown in Figure 6. It's clearly that the contents of ∑PCBs in natural waters is the NeiQinhuai River > the Yunliang River > the Wai- Qinhuai River > the city lakes. The average contribution rate of 7 PCBs concentration is PCB52 > PCB180 > PCB101 > PCB118 > PCB153 > PCB138 > PCB28. ∑PCBs concentration ranges from 2.66 ng/L to 474.30 ng/L with the highest point in the Shangfu Bridge, followed by the downstream of sewage treatment plant and point 1#, the concentrations of 290.01 ng/L and 252.04 ng/L. The distribution of PCBs in pollutant source is shown in Figure 7. It's clearly that the contents of ∑PCBs is Qingjiang bridge > Tiechuangleng > upstream of Yunliang River > South Yudai River > Xiaodoumen > Shitoucheng > Jiangxinzhou sewage plant > Qingliangmen > Chengdong sewage plant > Upstream of Qinhuai River > Chengbei sewage plant > Xianlin sewage plant. ∑PCBs concentration ranges from 1.04 ng/L to 614.42 ng/L with the main factor of PCB52, PCB118 and PCB180. Polycyclic aromatic hydrocarbon (PAH). The distribution of PCBs in natural water is shown in Figure 8. It's clearly that the contents of ∑PAHs in natural waters is the WaiQinhuai River > the NeiQinhuai River > the Yunliang River > the city lakes. The average contribution rate of 16 PAHs concentration is Naphthalene > Acenaphthene (Ace) > Phenanthrene > Fluorene > Indeno [1,2,3-cd] pyrene (InP) > Benzo [b] fluoranthene (BbF) > Acenaphthene > Benzo [a] anthracene (BaA) > Two benzo [a, H] anthracene > Fluoranthene > Pyrene > Chrysene (Chr) > Benzo[g,h,i]perylene (BPR) > Benzo [k] fluoranthene (BkF) > Benzo[a]pyrene (BaP) > Anthracene (ANT). ∑PAHs concentration ranges from 16.93 ng/L to 455.95 ng/L with the highest point in the Fengtai bridge, followed by point 1# and 5#, the concentrations of 226.24 ng/L and 220.70 ng/L. The distribution of PCBs in pollutant source is shown in Figure 9. It's clearly that the contents of ∑PAHs is Tiechuangleng > Qingjiangqiao > Shitoucheng > Upsteam of Yunliang River > Qingliangmen > Xiaodoumen > Chengdong sewage plant > South Yudai River > Jiangxinzhou > Xianlin sewage plant > Upsteam of Qinhuai River > Chengbei sewage plant. ∑PAHs concentration ranges from 11.90 ng/L to 1064.68 ng/L with fluoranthene ,the main factor of naphthalene, Ace, fluorine, phenanthrene, BaA, BbF and InP. From the comparison of heavy metal and environmental endocrine disruptors in different types of natural water and the pollution source, we can get that there are different concentration of Zn, Pb, As, Fe, Mn, Cd, Cr and Cu in natural water and pollution source, in which the main characteristic factors in upstream and tail-water of sewage plant; The main phthalic acid esters in studied natural waters are DMP, DEP, DiBP, DBP, BMPP, DPP, BBP, DCHP, DEHP. And the concentrations of DMP, DiBP and DBP are higher. PCB52, PCB180 are mainly in natural water, and the concentrations are higher in upstream and storm runoff. The PAHs in natural water conclude of naphthalene, Acenaphthene (Ace), phenanthrene, fluorine, Indeno (1,2,3-cd) pyrene (InP), Benzo (b) fluoranthene (BbF), acenaphthene, Benzo[a] anthracene (BaA),Two benzo (a, H) anthracene, fluoranthene, pyrene, chrysene (Chr), benzo[g,h,i]perylene (BPR), benzo(k) fluoranthene (BkF), benzo[a]pyrene (BaP), anthracene(ANT). The concentration of naphthalene, fluorene, BaA, BaP and InP are higher in upstream water, and those of naphthalene, acenaphthene, fluorene, BaP and InP are higher in storm runoff.

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Figure 1. Distribution of monitoring points.

Table 1 . Characteristic value and contribution rate.

Figure 2. Distribution of heavy metal in natural water.

Table 2 . Characteristic value and contribution rate in pollutant source.

Figure 3. Distribution of heavy metal in pollutant source.

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