Less metal fluxes than expected from fibrous marine sediments

MARINE POLLUTION BULLETIN

卷:150

Article

Frogner-Kockum, Paul¹  Kononets, Mikhail²  Apler, Anna^3,4  Hall, Per O. J.²  Snowball, Ian⁴ 

[1] Swedish Geotech Inst, SE-21122 Malmo, Sweden

[2] Univ Gothenburg, Dept Marine Sci, Box 461, SE-40530 Gothenburg, Sweden

[3] Geol Survey Sweden, Dept Marine Environm & Planning, Box 670, SE-75128 Uppsala, Sweden

[4] Uppsala Univ, Dept Earth Sci, Villavagen 16, SE-75236 Uppsala, Sweden

关键词: Contaminated sediments;    Fiberbank deposits;    Benthic flux chamber;    Metal fluxes;   

DOI  :  10.1016/j.marpolbul.2019.110750

来源: Elsevier

【 摘 要 】

Deposits of fibrous sediment, which include fiberbanks and fiber-rich sediments, are known to exist on the Swedish seafloor adjacent to coastally located former pulp and paper industries. These deposits contain concentrations of hazardous substances that exceed national background levels and contravene national environmental quality objectives (EQOs). In this study of metal fluxes from fibrous sediments using benthic flux chamber measurements (BFC) in situ we obtained detected fluxes of Co, Mo, Ni and Zn, but no fluxes of Pb, Hg and Cr. The absence of fluxes of some of the analyzed metals indicates particle bound transport of Pb, Cr and Hg from fiberbanks even though Hg might become methylated under anoxic conditions and, in that case, may enter the food chain. We found less metal fluxes than expected and thus emphasize the importance of in-situ flux measurements as a compliment to sediment metal concentrations within risk assessments of contaminated sediments.

【 授权许可】

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