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| sample | Pb(II) | Cr(III) | Cu(II) | Cd(II) | Cr(IV) | Mn(VII) | Mn(II) |
|---|---|---|---|---|---|---|---|
| TEOS/EDTA | 4.2 | 2.7 | 3.2 | 4.2 | - | - | 3.4 |
| NaSi/EDTA/NH2 | 5.0 | 2.9 | 3.5 | 4.6 | - | - | 3.5 |
| NaSi/NH2 | 5.1 | 3.4 | 3.2 | 4.6 | - | - | 5.1 |
| TEOS/QAS | - | - | - | - | 2.5 | 4.0 | - |
