Table 3. Dissolution Procedure for the PN-MC-ICP-MS Analysis.
| acid | T(°C) | t(h) | Tevaporation(°C) | tevaporation(h) |
|---|---|---|---|---|
| 3 mL 14 M HNO3 | 200 | 1 | 200 | 4 |
| 1 mL HClO4 | 200 | 0.5 | 240 | 1 |
| 3 mL HF | 90 | 13 | 180 | 4 |
| 3 mL aqua regia | 200 | 1 | 200 | 4 |
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