Fig. 3. Metal concentrations in 1 N HCl leached fraction and crustal enrichment factors for bulk samples in stream sediments with distance from upstream of Zn refinery to lake An-Dong. Enrichment factors for sediments in five tributaries were also depicted.Figure optionsDownload full-size imageDownload as PowerPoint slide
Total dissolvable metal concentrations of Cu, Zn, As, Cd and Pb in AMG232 downstream sites of the main channel, especially for sites (R1–R4) close to the smelter, were considerably higher than half-life at the upstream site (R5); however, As concentrations in the lower reaches (R6–R9) were markedly higher than those in the upper reaches (R1–R4) (Fig. 4). High dissolved As concentrations were also detected in tri-1 and tri-3, while a high dissolved Zn concentration was found in tri-3. Cd concentrations decreased steadily towards the lake, though levels remained high in lake waters; however, Cu, Zn and Pb were detected at much higher concentrations in lake waters than in stream waters in the lower reaches.