title: Estimation of antimony concentration in riverine system for ecological risk assessment.
abstract: The purpose of this study was to find a way to simulate the concentration of antimony in river water in order to obtain the data necessary for ecological risk assessment. The antimony concentration decrease coefficient (K') was introduced in the continuous plane source approximation of the one-dimensional form of the advective-dispersion equation in order group all removal processes into one parameter due to lack of sufficient data on antimony and sediments in Kuzuryu River, Japan, where the industrial zone discharges the antimony found most frequently. K' was calibrated according to the released and measured concentration of antimony, its value was 2.6 E-4.0 s(-1). The comparison between the calculated concentrations of antimony based on K' and the hazardous concentration affecting 5% of aquatic species (HC5) calculated from the species sensitivity distribution (SSD) of antimony, showed that the ecological risk quotient is larger than that under dry weather conditions.
authors.affiliation: Chemical Risk Management Research Center, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Nawahda
authors.forename: A
authors.initials: A
authors.lastname: Tokai
mesh_terms: D000965:Antimony / Q000032:analysis*; D004463:Ecology; D005618:Fresh Water; D018570:Risk Assessment; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D000965:Antimony