College of Chemistry, Changchun Normal University, Changchun 130032, China.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, China.
Sci Total Environ. 2022 Oct 1;841:156818. doi: 10.1016/j.scitotenv.2022.156818. Epub 2022 Jun 18.
Heavy metals in ocean may accumulate in seafood through food web and pose risks to human health. This study investigated the occurrence, trophic magnification, and health risks of 7 heavy metals in 20 marine organisms (n = 222) in Laizhou Bay (LZB), China. Results showed that Zn was the most abundant metal, followed by Cu, As, Cd, Cr, Ni and Pb. The total concentrations of 7 heavy metals in the organisms ranked in the order of crab ˃ shellfish ˃ algae ˃ fish ˃ starfish. Interspecific differences were found in the concentrations of Cr, Ni, Cu and Cd in marine organisms from LZB. Crab and shellfish showed much higher enrichment ability of heavy metals than that of algae, starfish and fish. Cd is the most biological accumulated element with the mean biota-sediment accumulation factor (BSAF) of 12.9. Stable isotope analysis showed a significant difference of δN among these five species (p < 0.01), and a food web was constructed accordingly. A biodilution pattern was found for Pb, As and Ni and no trophic interference in metal uptake was observed for Zn, Cu, Ni and Cr in the food web of LZB. The estimated daily intake (EDI) and target hazard quotients (THQs) of As and Cd indicated an adverse health effect on consumption of the seafood. The mean lifetime cancer risks (LCRs) for Cd and As suggested a potential carcinogenic effect on consumption of these seafood. This study provides a basis for health risk assessment of heavy metals in marine foods.
海洋中的重金属可能通过食物网在海鲜中积累，并对人类健康构成风险。本研究调查了中国莱州湾（LZB）20 种海洋生物（n = 222）中 7 种重金属的发生、营养放大和健康风险。结果表明，Zn 是最丰富的金属，其次是 Cu、As、Cd、Cr、Ni 和 Pb。生物体内 7 种重金属的总浓度顺序为蟹类＞贝类＞藻类＞鱼类＞海星。LZB 海洋生物中 Cr、Ni、Cu 和 Cd 的种间浓度存在差异。蟹类和贝类比藻类、海星和鱼类具有更高的重金属富集能力。Cd 是最具生物累积性的元素，生物 - 沉积物积累因子（BSAF）平均值为 12.9。稳定同位素分析表明，这 5 种物种的δN 存在显著差异（p < 0.01），并据此构建了食物网。在 LZB 的食物网中，Pb、As 和 Ni 表现出生物稀释模式，而 Zn、Cu、Ni 和 Cr 在金属吸收中没有观察到营养干扰。As 和 Cd 的估计每日摄入量（EDI）和目标危害系数（THQ）表明，食用这些海鲜可能对健康产生不利影响。Cd 和 As 的平均终生癌症风险（LCR）表明，食用这些海鲜可能具有潜在的致癌作用。本研究为海洋食品中重金属的健康风险评估提供了依据。
