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| Serum-RM preparation | from gravimetric preparation, ρ ± uc (g L–1) | from online ID CE/ICP–MS measurement, ρ ± 2 s, n = 6 (g L–1) |
|---|---|---|
| 1 | 17.6 ± 0.5 (3.0%) | 18.1 ± 0.8 (4.4%) |
| 2 | 11.1 ± 0.3 (3.1%) | 11.1 ± 0.8 (7.2%) |
