Contamination characteristics of heavy metal and risk assessment of seafood safety for bivalves Meretrix meretrix collected from the northern coastal area of Dongying City
PENG Li-hong, MENG Fan-ping, LIU Qun-qun, DUAN Wei-yan
Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
Concentrations of seven heavy metals were determined in the clams Meretrix meretrix collected from the northern coastal area of Dongying City in October, 2016, to explore the contamination characteristic of these metals. Bioaccumulation and its influence factors of the heavy metals by M. meretrix from sediment environment were discovered. Consumption risk for these clams was also evaluated using the single factor pollution index (Pi) and the target hazard quotients (THQs) models. Results demonstrated that the concentrations of Hg, As, Pb, Cd, Cr, Cu, and Zn varied as 0.009~0.019, 0.51~0.80, 0.25~0.76, 0.45~0.76, 0.43~2.46, 1.83~3.78, and 14.33~17.75mg/kg, respectively. Comparing with other coastal areas, the contamination of heavy metals was at medium level in the clams M. meretrix investigated in this study. The contamination of heavy metals was the worst in the clams from the sampling site S5 based on the metal pollution index (MPI) model. The highest bioaccumulation capacity in M. meretrix occurred for Cd, and the average biota-sediment accumulation factor (BSAF) was calculated as 455.13%. Among these heavy metals, only Pb presented a significant positive correlation between its BSAF value and total content in sediment, while the bioaccumulation of Hg and Cu were positively and negatively correlated with the fine grain size (particle size <63μm, FGS) and organic matter (OM) contents in the sediments, respectively. The THQs values indicated that a potential health risk will be mainly caused by the heavy metal As through a long-term clam consumption. Therefore, some effective measures should be taken to reduce the accumulation of heavy metals, especially the element As, in clams in order to protect consumer health.
彭礼洪, 孟范平, 刘群群, 段伟艳. 东营市北部海域文蛤重金属污染特征与食用风险评价[J]. 中国环境科学, 2020, 40(4): 1800-1808.
PENG Li-hong, MENG Fan-ping, LIU Qun-qun, DUAN Wei-yan. Contamination characteristics of heavy metal and risk assessment of seafood safety for bivalves Meretrix meretrix collected from the northern coastal area of Dongying City. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1800-1808.
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