Levels and health risks of Cu, Cd, Pb in Sinonovacula constricta and Tegillarca granosa in Xiangshan Bay
象山港养殖区缢蛏和泥蚶的Cu、Cd、Pb含量及其健康风险评价

The contents of Cu, Cd and Pb in the two important cultured molluscs (Sinonovacula constricta and Tegillarca granosa) from 5 sites in Xiangshan Bay, Ningbo over the 4 seasons in 2010 were analyzed. The health risks of the heavy metals were subsequently assessed with two health risk evaluation models. The results showed that in different cultured areas, the contents of Cu, Pb, Cd in S.constricta and T.granosa were 2.89~4.99, 0.24~0.39, 0.12~0.22 mg·kg-1 and 0.79~1.05, 0.10~0.38, 2.17~4.60 mg·kg-1, respectively. The contents of Cu, Pb, Cd in S.co nstricta and T.granosa were 1.52~10.48 and 0.66~1.20 mg·kg-1, 0.08~0.68 and 0.02~1.01 mg·kg-1, 0.04~0.50 and 0.74~4.43 mg·kg-1, respectively. Within each species, the contents of Cu, Pb, Cd were similar between the one-year- and two-year-old groups. Based on the USPEA and PMTDI health risk evaluation models, the contents of Cu, Pb, Cd in the two cultured molluscan species posed no health risk to human except for Cd in T. granosa.