A Study on Total Mercury and Methylmercury in Commercial Tuna, Billfish, and Deep-sea Fish in Seoul Metropolitan City
2013
Kim, J.A., Seoul Metropolitan Government Research Institute of Public Health and Environment, Republic of korea | Yuk, D.H., Seoul Metropolitan Government Research Institute of Public Health and Environment, Republic of korea | Park, Y.A., Seoul Metropolitan Government Research Institute of Public Health and Environment, Republic of korea | Choi, H.J., Seoul Metropolitan Government Research Institute of Public Health and Environment, Republic of korea | kim, Y.C., Seoul Metropolitan Government Research Institute of Public Health and Environment, Republic of korea | Kim, M.S., Seoul Metropolitan Government Research Institute of Public Health and Environment, Republic of korea
In this study, we monitored total mercury and methylmercury concentrations in tuna, billfish, and deep-sea fish distributed in Seoul city. With the acquired data, we carried out statistical analysis and an exposure assessment for intake. The mean concentrations (mg/kg) of total mercury and methylmercury were 0.32±0.31/0.20±0.20 for tuna, 0.43±0.48/0.20 ±0.17 for patagonian toothfish, 0.99±0.72/0.51±0.40 for billfish and 1.20±0.70/0.95±0.51 for sharks, respectively. We found that sharks, billfish, patagonian toothfish, and tuna were more contaminated with total mercury and methylmercury, in sequence, and that 66% of the total mercury concentration consisted of methylmercury, on average. Although the estimated weekly intakes of methylmercury from commercial deep-sea fish were lower than the weekly intakes recommended by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), we identified that the total mercury and methylmercury concentrations in tuna, billfish, and deep-sea fish continued to increase with the passage of time. Therefore, we confirmed the necessity of continuous monitoring and comprehensive analysis for general safety.
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