CONG Xin, LEI Xutao, Fuling, SHANG Siyao, DING Jing，BI Ran

（College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, China）

Abstract: Surface soil samples were collected systematically from the soils near the gangue heap of Haizhou coal mine in Fuxin area, China. Characteristics of pollution and potential ecological risk of the heavy metals were studied. Results of the data analyses show that the soils around the gangue heap have an accumulation of heavy metals which were caused by the weathering and leaching of coal gangues, however, the mining period of the study area was only more than 10 years. The concentrations of Cu and Ni in soil exceed the corresponding limits of Chinese National Soil Environmental Quality Standard Ⅱ(GB15618-1995). The spatial distribution results of heavy metals in soils indicate that the contents of heavy metals in soil decrease with increasing distance from the gangue heap. Results of speciation analysis show that the inactive residual fraction is the dominant phase for heavy metals studied in the soils. The lowest content fraction is acid extractable phase. Potential ecological risk assessment of heavy metals was performed by using Hakanson’s ecological risk index. Results suggest that the pollution of the study area is moderate. The degrees of heavy metals pollution are in the order of Cr> Ni >Cu>Pb>Zn. Ni is one of the most important potential ecological risk factors.

Key words: gangue heap; heavy metal; soil; ecological risk assessment

EARTH AND ENVIRONMENT Vol.45, No.3, Tot No.317, 2017, Page 329-335