Character and human health risk assessment of polychorinated biphenyls（PCBs） and organochlorine pesticides（OCPs）in marine organisms from Zhao’an Bay

In this study, samples of molluscs, shrimp, shellfish and fish collected during four surveys in Zhao’an Bay were analyzed by GC and the index of CRI (carcinogenic risk index) and ERI (expose risk index) were used to evaluate the human health risk assessment. Results showed that the content of PCBs、HCHs and DDTs in the samples ranged between Nd (not detected) to 7.32, 0.65 ng?g-1 and 152.82 ng?g-1, respectively. The 3,3’,4,4’- tetrachlorobiphenyl was the major composition of PCBs; HCHs were undetected in most samples and did not show obvious compositional characterization; the 4.4′-DDT was the main component among the four DDTs in samples. The average of DDT/∑DDTs ratio was 68% showing that there might be new input of DDTs in the bay recently. The CRI that is less than 10-4 indicated that cancerization risk to humans was acceptable and ERI of less than 1 mean the contact action would not threaten the human health .