Bioaccessibility-corrected risk assessment of urban dietary methylmercury exposure via fish and rice consumption in China

The Science of the Total Environment
Yu GongHuan Zhong

Abstract

The role of seafood consumption for dietary methylmercury (MeHg) exposure is well established. Recent studies also reveal that rice consumption can be an important pathway for dietary MeHg exposure in some Hg-contaminated areas. However, little is known about the relative importance of rice versus finfish in MeHg exposure for urban residents in uncontaminated areas. Especially, the lack of data on MeHg bioaccessibility in rice hinders accurately assessing MeHg exposure via rice consumption, and its importance compared to fish. By correcting commonly used risk models with quantified MeHg bioaccessibility, we provide the first bioaccessibility-corrected comparison on MeHg risk in rice and fish for consumers in non-contaminated urban areas of China, on both city- and province-scales. Market-available fish and rice samples were cooked and quantified for MeHg bioaccessibility. Methylmercury bioaccessibility in rice (40.5±9.4%) was significantly (p<0.05) lower than in fish (61.4±14.2%). This difference does not result from selenium content but may result from differences in protein or fiber content. Bioaccessibility-corrected hazard quotients (HQs) were calculated to evaluate consumption hazard of MeHg for consumers in Nanjing city, ...Continue Reading

Citations

May 6, 2019·Bulletin of Environmental Contamination and Toxicology·Wenli TangHuan Zhong
Jan 14, 2021·Bulletin of Environmental Contamination and Toxicology·Yang LuoYonggui Wu
Mar 17, 2021·The Science of the Total Environment·Pei LeiHuan Zhong
Apr 12, 2021·Bulletin of Environmental Contamination and Toxicology·Menghan ChengXuejun Wang
Sep 10, 2020·Ecotoxicology and Environmental Safety·Yao SuHuan Zhong
Apr 16, 2019·Environmental Science & Technology·Wenli TangHuan Zhong

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