**12. Conclusions**

1.The adsorption capacity of natural zeolites is more optimal when the chemical formula has as its central axis a binary compound, (**Figure 5**), (O Mg) and no interchangeable bases,

(**Figure 6**) (Na, K, Mg) and in the liquid phase there is only a heavy metal (Zn2+).


4.The saturation time in the test with (**Figure 5**) was a bit slow after the 5th hour.


*Heavy Metals – Recent Advances*
