Table 1.
Effect of possible interfering ions on the SPE preconcentrations of Co(II) and Hg(II).
| Recoverya (%) | |||
|---|---|---|---|
| Interferences | Interferic ion to metal ion ratio | Co(II) | Hg(II) |
| Na(I) | 8000 | 98 ± 0.4 | 99 ± 0.2 |
| K(I) | 8000 | 97 ± 0.6 | 99 ± 0.7 |
| Ca(II) | 200 | 98 ± 1.4 | 100.1 ± 0.9 |
| Mg(II) | 200 | 98 ± 0.8 | 99 ± 0.5 |
| Zn(II) | 20 | 97 ± 1.4 | 98 ± 0.8 |
| Fe(II) | 20 | 97 ± 1.0 | 98 ± 0.9 |
| Cd(II) | 10 | 98 ± 1.3 | 99 ± 1.1 |
| Cu(II) | 10 | 97 ± 1.4 | 98 ± 0.7 |
| Ni(II) | 10 | 96 ± 0.9 | 97 ± 1.4 |
| Al(III) | 10 | 97 ± 0.7 | 97 ± 1.3 |
aConcentrations of the heavy metal ions are 10 µg L−1.