Table 4: Recovery of the potentiometric method of GEMI.
| Sample content M | Standard added M | p [Concentration] | Found log[Concentration] | Recovery (% ± RSD)* |
|---|---|---|---|---|
| 1 × 10-4 | 1 × 10-4 | 3.70 | 4.14 | 111.8 ± 0.64 |
| 1 × 10-4 | 2 × 10-4 | 3.52 | 3.64 | 103.41 ± 1.81 |
| 1 × 10-4 | 3 × 10-4 | 3.40 | 3.34 | 98.23 ± 0.77 |
| 1 × 10-4 | 4 × 10-4 | 3.30 | 3.16 | 95.76 ± 0.94 |
| 1 × 10-4 | 5 × 10-4 | 3.22 | 3.07 | 95.28 ± 0.83 |