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Indexed by:期刊论文

Date of Publication:2014-06-01

Journal:ENVIRONMENTAL POLLUTION

Included Journals:SCIE、EI、PubMed、Scopus

Volume:189

Page Number:215-222

ISSN No.:0269-7491

Key Words:DGT (diffusive gradient in thin films); Bioavailability; Chemical equilibrium models; Watertype-specific risk assessment

Abstract:The spatial distribution of metal bioavailability (Ni, Cu, Zn, and Pb) was first evaluated within the waters of Daliao River watershed, using the diffusive gradient in thin films (DGT) and chemical equilibrium models. To assess potential risks associated with metal bioavailability, site-specific 95% protection levels (HC5), risk characterizations ratios (RCR) and ratios of DGT-labile/HC5 were derived, using species sensitivity distribution (SSD). The highest bioavailability values for metals were recorded in the main channel of the Daliao River, followed by the Taizi River. Dynamic concentrations predicted by WHAM 7.0 and NICA-Donnan for Cu and Zn agreed well with DGT results. The estuary of the Daliao River was found to have the highest risks related to Ni, Cu, and Zn. The number of sites at risk increased when considering the total toxicity of Ni, Cu, and Zn. (C) 2014 Elsevier Ltd. All rights reserved.