Characteristics of Cadmium migration in the reclaimed soil filled with the coal gangue from the Xinzhuangzi mine in Huainan

Cadmium is a heavy metal element that can seriously harm human health with strong biological toxicity. The trace analysis on content of Cadmium (Cd) element in the soil and coal gangue was conducted to ensure the ecological security of the reclaimed land with mine filling, which was used to grow crops. The managed area of mine gangue filling reclamation in Huainan was the object. The results show that the Cadmium element content in each layer on the vertical dimension were higher than the soil background values of Huainan and that of China. The over standard rate of Cadmium is the highest near the padding-coal gangue. From the spatial distribution in the soil of Cadmium Elements on the horizontal and vertical distribution, the ecological environment of the mine reclamation area was seriously directly or indirectly polluted by the eluviation emissions and migration of heavy metals, from coal gangue filling, Cadmium is enriched and even reaches the pollution level.