Abstract:
The construction of mining parks is an important way to restore and manage the ecological environment of mines, and the assessment of the soil remediation effect of mine parks is of great significance to the construction and operation of mining parks and the safety of tourists. 66 soil samples were collected from 0-30 cm of dry soil on unhardened ground in the mining park, and the contents of heavy metals Mn, Cr, Zn, Pb, As, Cu, Ni and Hg were measured. The comprehensive pollution index, potential ecological risk index and health risk assessment model were used to evaluate pollution status, potential ecological risk and human health risk of the remediated soil. The results showed that the average values of each metal element in M Mining Park were Mn > Cr > Zn > Pb > As > Cu > Ni > Hg, where the average values of Cr, Mn, Cu, As and Pb were 1.23, 1.80, 1.12, 2.05 and 1.34 times of the background values of Hunan soil, respectively. The Nemerow comprehensive pollution index was 0.51, which was at a safe level. The single factor potential risk index for each heavy metal element was at the low ecological risk level, and the average potential ecological risk index was 81.64, which was at the low ecological risk level, showing there was no potential ecological risk. The total non-carcinogenic risk value for children and adults was respectively 2.46×10
−1 and 7.43×10
−2, which did not cause non-carcinogenic risk, and the total carcinogenic risk index was 1.38×10
−7, which did not have carcinogenic risk. Overall, after ecological restoration, the mine park would have no ecological risk and health risk of heavy metals in soil, suitable for tourism and recreation for various populations.