Contamination, Ecological Risk and Source Apportionment of Heavy Metals in the Surface Sediments in the Hailar River, the Upper Source of the Erguna River between China and Russia

The concentrations of heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn) in 17 surface sediment samples from the Hailar River, upper source Ergun which is boundary river between China Russia, were analyzed. Traceability cause analysis carried out by correlation principal component analysis. results showed that Hg Cd sediments exceeded soil background values. Due to high biological toxicity factor highest potential ecological risk River its tributary Yimin River. sources As likely come human activities including mining, coal burning animal husbandry; other HMs, especially Zn mainly mining natural factors. level urbanization more agricultural activities, pollution lower reaches was greater. this study will help understand distribution basin provide management support for China’s local environmental departments relevant national China.