Authors: Nawahda, A.; Tokai, A.

Source: Environmental Technology, Volume 28, Number 10, October 2007 , pp. 1187-1194(8)

Publisher: Taylor and Francis Ltd

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.

Keywords: ANTIMONY; CONCENTRATION DECREASE; ECOLOGICAL RISK; RISK QUOTIENT; SPECIES SENSITIVITY

Document Type: Research article

Publication date: 2007-10-01

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