Table 2.
Operating conditions of the ICP-MS and the chromatographic systems.
| Inductively coupled plasma mass spectrometry (ICP-MS) | |
|---|---|
| Radio frequency power | 1300 W |
| Sampler and skimmer cones | Nickel |
| Argon flow rates: | |
| Plasma | 15 L/min |
| Auxiliary | 0.86 L/min |
| Nebulizer | 0.96 L/min |
| Date acquisition mode | Graphics (signal intensity versus time) |
| Analytical mass (amu) | 75As |
| Chromatography | |
| Anion exchange | |
| Guard column | IonPac AG 19 (50 × 4 mm) |
| Analytical column | IonPac AS 19 (250 × 4 mm) |
| Mobile phase | 10 mmol/L CH3COONa, 3 mmol/L KNO3, 2 mmol/L NaH2PO4, and 0.2 mmol/L EDTA-2Na adjusted to pH 10.7 with 4% NaOH |
| Flow rate | 1.0 mL min−1 |
| Injection volume | 30 μL |