The study was conducted to assess the health risks of selected metals in cultured and wild Crassostrea madrasensis in Sri Lanka over 13 months. Metal concentrations varied monthly, and Zn and Cu concentrations significantly varied between cultured and wild oysters. The mean metal concentrations (mg kg⁻¹) were accumulated in order of Zn (1220.60) > Mg (496.97) > Fe (356.30) > Cu (114.95) > Pb (23.20) > Cd (6.15) > As (3.09) > Hg (0.12). The metal concentrations were well below the standard guidelines given by international standards except for Pb, Cd, As and Zn. The weekly intakes of Hg, Cu, Fe, and Zn from C.madrasensis were below the Provisional Tolerable Weekly Intake while Cd exceeded the established limit. The calculated non-carcinogenic and carcinogenic risk indices for Hg, As, Pb and Zn were within safe levels and the values for Cd exceeded the limit revealing carcinogenic results with long-term consumption. Hence, creating proper awareness and a suitable depuration system ensures human health and supports export-oriented markets.

该研究旨在评估斯里兰卡养殖和野生马德拉牡蛎中选定金属在 13 个月内的健康风险。金属浓度每月变化，并且养殖牡蛎和野生牡蛎之间的锌和铜浓度显着变化。平均金属浓度（mg kg ^-1）累积顺序为Zn（1220.60）> Mg（496.97）> Fe（356.30）> Cu（114.95）> Pb（23.20）> Cd（6.15）> As（3.09）>汞（0.12）。除 Pb、Cd、As 和 Zn 外，金属浓度均远低于国际标准给出的标准指导值。C.madrasensis中汞、铜、铁和锌的每周摄入量低于临时每周耐受摄入量，而镉则超出了既定限度。计算得出的Hg、As、Pb、Zn的非致癌和致癌风险指数均在安全范围内，Cd的值超出了长期食用致癌结果的限值。因此，建立适当的意识和合适的净化系统可确保人类健康并支持出口导向型市场。