title: Relating metal bioavailability to risk assessment for aquatic species: Daliao River watershed, China.
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.
authors.affiliation: Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan. Electronic address: han-shuping-cw@ynu.jp.
authors.forename: Shuping
authors.initials: S
authors.lastname: Han
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Dalian, Liaoning Province 116024, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan. Electronic address: masunaga@ynu.ac.jp.
authors.forename: Shigeki
authors.initials: S
authors.lastname: Masunaga
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Dalian, Liaoning Province 116024, China.
authors.forename: Siyun
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa Tsukuba, Ibaraki 305-8569, Japan.
authors.forename: Wataru
authors.initials: W
authors.lastname: Naito
mesh_terms: D000818:Animals; D059001:Aquatic Organisms / Q000378:metabolism; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D008670:Metals / Q000032:analysis*; D018570:Risk Assessment; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical
keywords: Bioavailability; Chemical equilibrium models; DGT (diffusive gradient in thin films); Watertype-specific risk assessment