For the NZVI/NaY sample, a significant decrease of iron leaching was observed. After reaction, the amount of dissolved iron
ions accounted for less than 50% of total iron. (This observation was also supported by Table 1).
The heterogeneous catalytic contribution of NZVI/NaY could be testified. Significantly lower concentration of
iron ions in the solution after the treatment could give a great advantage to NZVI/NaY system over the homogeneous Fenton type system.