Table 2.
Figures of merit of the optimized CE-ICP-MS/MS method
| Functional group | RSD (%) | Capillary recovery (%) (n = 3) | Detection limit for MS/MS | Average effective electrophoretic mobility (×109, m2 V−1 s−1, n = 6) | ||||
|---|---|---|---|---|---|---|---|---|
| Migration time | Peak area | |||||||
| Intraday (n = 6) | Inter-day (n = 3) | Intraday (n = 6) | Inter-day (n = 3) | 56Fe+ (ng mL−1 Fe) | 56Fe16O+ (ng mL−1 Fe) | |||
| Carboxyl | 0.23 | 1.92 | 4.27 | 4.98 | 96.7 | 2.9 | 54 | −5.69 ± 0.03 |
| Amino | 0.52 | 3.25 | 2.81 | 4.95 | 93.3 | 5.0 | 101 | 11.41 ± 0.02 |