| Summary: | The aim of this study was to investigate the effect of natural zeolite amendment to contaminated soil on the heavy metal (Cd, Cr, Cu, Pb and Zn) simulated bioavailability over a three-month period of storage. Two pot experiments were created by amending soil with two different amounts of natural zeolite (3 and 6 wt.%). During the experiment, pH level, metal concentrations in soil solution (C<sub>sol</sub>) and metal concentrations in soil by the diffusive gradients in thin-films technique (C<sub>DGT</sub>) were determined. When the zeolite was added to the soil, a significant decrease (<i>p</i> = 95%, <i>n</i> = 3) for Cd and Pb concentrations, both in C<sub>sol</sub> and in C<sub>DGT</sub>, was observed. The Cu, Cr and Zn concentrations also showed a decreasing trend, but the changes in their concentrations were not statistically significant. The R ratio between C<sub>DGT</sub> and C<sub>sol</sub> was calculated for each metal in order to assess the resupply of metals from the soil solid phase to soil solution. The R values significantly decreased for Cd and Pb, showing a low resupply from the solid phase in the samples with added zeolite.
|
|---|