| Abstract: | In this study, integrative trail was used to sediment quality in the Le An River, which has been strongly contaminated by large amount of Cu, Pb, Zn,Cd, As and Cr discharging from mining activity. All available data collected from chemical analyses,toxic tests and field survey on benthic macroinvertebrates were transformed into Ratio-to-reference(RTR) and relevant scales.The responses of receiving environment to mining impacts were illustrated by traid graphs. Traid results indicated that a sectional-distribution pattern existed from upstream to downstream:(2) relative clean upstream;(b) serious contaminated middle stream;(c) gradual recovery downstream. This situation was closely related with local mining activities, which caused obvious degradation of sediment quality in some sections, therefore,remediation was required urgently. |
