Fig 1.
Distribution of sampling points in the tailing pond of the Qingshan lead-zinc mine.
Table 1.
Heavy metal detection methods and instruments.
Fig 2.
XRD pattern of the Pb‒Zn tailings.
Fig 3.
SEM image of the lead-zinc tailings.
Table 2.
Physical and chemical properties of tailing samples at each depth of profile.
Table 3.
Statistical results of the total heavy metals in the soil around the Qingshan lead-zinc mine.
Fig 4.
Proportion of chemical forms of heavy metals in soils.
Table 4.
Concentrations of heavy metals in agricultural soils around a tailing pond from 2008–2016 (mg/kg).
Fig 5.
Smoothed number of heavy metal concentration indices in agricultural land near mine tailing dams (2008–2016).
Fig 6.
Smoothing values of the soil heavy metal concentration indices at different times.
Fig 7.
Prediction of soil lead concentration under different smoothing coefficients.
Fig 8.
Error analysis of the Pb concentration with different smoothing coefficients.