Abstract: ObjectiveTo study polychlorinated biphenyls(PCBs)pollution level in seafood and tidal-flat environment of the south of Hangzhou Bay.MethodsSeven kinds of seafood and tidal-flat sediments were collected from six tidal-flat farms in south of Hangzhou Bay from 2010 to 2011.The contents of PCBs were determined with gas chromato-graphy-tandem mass spectrometry(GC-MS/MSO)and the correlation between PCBs and seafood and tidal-flat pollution was analyzed.ResultsConcentration ranges of PCBs in 880 samples of 7 kinds of seafood were 43.69-147.14 μg/kg.Concentration ranges of PCBs in tidal-flat sediments were 8.41-25.87 μg/kg.There were significant differences in the content of PCBs of seafoods and tidal-flat sediments from different tidal-flat farm areas(P<0.05).The content of PCBs in seafood was significantly correlated with tidal-flat sediments(P<0.047)and the enrichment of PCBs in biological systems was observed.ConclusionResidues of PCBs are detectable in seafoods and tidal-flat sediments from the south of Hangzhou Bay and the PCBs pollution of seafoods is correlated to that of tidal-flat.