期刊
CHEMOSPHERE
卷 281, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.130836
关键词
Hg; Seafood; Stable isotopes; Biomagnification; TTF; Risk assessment
资金
- National Natural Science Foundation of China [U1706217, 41671462]
The study found that Hg concentrations in organisms in Jiaozhou Bay did not exceed threshold limits, with fish > crustaceans > mollusks, and biomagnification of MeHg is higher than IHg in the food chain.
In this study, 26 surface seawater samples, 26 surface sediment samples and 114 organisms were collected to study the tmphic transfer and dietary exposure risk of mercury (Hg) in organisms from the Jiaozhou Bay, which is a typical semi-enclosed urbanized bay. The total mercury (THg) and methylmercury (MeHg) concentrations did not exceed the threshold limits and performed as: fish > crustaceans > mollusks. The tmphic level values (TLs) were less than 3 in all the groups, indicating simple structure of food chain. With the increasing delta N-15 value, THg and MeHg were significantly biomagnified in the mollusks and fish but not in the crustaceans. In addition, the bioaccumulation and biomagnification of MeHg were higher than inorganic mercury (IHg) in the aquatic food chain. Target hazard quotient (THQ) and provisional tolerable weekly intake (PTWI) indicated that Hg exposure via consumption of seafood from the Jiaozhou Bay did not pose significant health risks for general population. Consuming fish will face the higher health risk than crustaceans and mollusks, especially in urban regions. Moreover, the risk of MeHg caused by intaking seafood deserved more attention. Trophic transfer function (TTF) explicated the transfer of Hg in the ecosystem and higher trophic transfer efficiency of MeHg than IHg. TTF interpreted the terrestrial input of Hg should be controlled to ensure the safety of consuming seafood from the Jiaozhou Bay.
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