alexa Influence of mangrove reforestation on heavy metal accumulation and speciation in intertidal sediments.
Toxicology

Toxicology

Journal of Environmental & Analytical Toxicology

Author(s): Zhou YW, Zhao B, Peng YS, Chen GZ, Zhou YW, Zhao B, Peng YS, Chen GZ

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Abstract To investigate the influence of mangrove reforestation on heavy metal accumulation and speciation in intertidal sediments, core sediments from a restored mangrove forest and adjacent mud flat in Yifeng Estuary (southeastern China) were analyzed. The chemical speciation of heavy metals (Pb, Zn, Cu, Cr and Ni) was determined according to a sequential extraction procedure. Special attention was paid to the upper 20cm of sediment, in which metal accumulation was enhanced and speciation was obviously modified. Mangrove reforestation decreased the concentrations of all metals in the acid-soluble fraction and increased metal concentrations in the oxidizable fraction. Increased Pb, Zn and Cu concentrations and decreased Ni and Cr concentrations were observed in the reducible fraction. These results suggest that mangrove reforestation facilitated the accumulation of heavy metals in the upper sediment layers but decreased their bioavailability and mobility. Copyright 2010 Elsevier Ltd. All rights reserved. This article was published in Mar Pollut Bull and referenced in Journal of Environmental & Analytical Toxicology

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