Table 2.
Elemental content of raw and modified zeolite as determined by neutron-activation analysis (NAA).
| Element | Raw Zeolite | Modified Zeolite | Element | Raw Zeolite | Modified Zeolite |
|---|---|---|---|---|---|
| Concentration, µg/g | Concentration, µg/g | ||||
| Na | 13,000 ± 1000 | 8590 ± 500 | Sr | 66.2 ± 6 | 100 ± 8 |
| Mg | 6600 ± 600 | 7400 ± 800 | Rb | 217 ± 20 | 186 ± 15 |
| Al | 67,700 ± 1500 | 61,300 ± 3000 | Sb | 0.25 ± 0.01 | 0.27 ± 0.02 |
| Si | 260,000 ± 26,000 | 270,000 ± 19,000 | Ba | 128 ± 10 | 205 ± 20 |
| Cl | <81 | 180 ± 25 | Cs | 7.57 ± 0.2 | n.d.* |
| K | 29,000 ± 2900 | 28,900 ± 3000 | Ce | 21.1 ± 2 | 15 ± 1.5 |
| Sc | 1.8 ± 0.06 | 1.9 ± 0.06 | Eu | 1.0 ± 0.08 | 0.6 ± 0.06 |
| Ca | 10,000 ± 800 | 18,000 ± 1800 | Gd | 3.6 ± 0.2 | n.d. |
| Mn | 350 ± 17 | 110 ± 7.5 | Tb | 0.4 ± 0.01 | 0.7 ± 0.03 |
| Fe | 8600 ± 600 | 7900 ± 500 | Yb | 2.1 ± 0.02 | 1.2 ± 0.01 |
| Zn | 60 ± 2.5 | 54 ± 2.0 | Hf | 6.3 ± 0.6 | 5.9 ± 0.04 |
| Br | 0.74 ± 0.02 | 0.98 ± 0.05 | Th | 17.1 ± 1.0 | 15.5 ± 0.7 |
| La | 12.5 ± 0.5 | 10 ± 0.6 | - | - | - |
*—not detected.