Table 4.
Method precision using 8 duplicate runs of quality controls (QCs), µg/L.
| Precision (%RSD) (n = 8) | |||||
|---|---|---|---|---|---|
| Analyte | QC Sample | Target | Mean | Repeatability (%) | Intermediate Precision (%) |
| Al | Low Spike | 7.50 | 7.48 | 2.7 | 3.2 |
| High Spike | 40.0 | 40.9 | 1.4 | 2.7 | |
| Cr | Low Spike | 0.375 | 0.360 | 1.8 | 3.7 |
| High Spike | 2.00 | 1.95 | 1.8 | 3.1 | |
| Fe | Low spike | 1.88 | 1.85 | 2.8 | 1.1 |
| High spike | 10.0 | 10.1 | 1.7 | 4.0 | |
| Co | Low spike | 0.375 | 0.390 | 2.8 | 3.7 |
| High spike | 2.00 | 2.09 | 2.1 | 3.8 | |
| Ni | Low spike | 0.375 | 0.394 | 3.5 | 9.6 |
| High spike | 2.00 | 2.01 | 0.9 | 2.1 | |
| Cu | Low spike | 0.750 | 0.744 | 1.7 | 2.9 |
| High spike | 4.00 | 3.97 | 1.2 | 2.8 | |
| Cd | Low spike | 0.0750 | 0.0725 | 2.5 | 2.2 |
| High spike | 0.400 | 0.394 | 1.4 | 2.6 | |
| Sn | Low spike | 0.150 | 0.169 | 2.3 | 13.7 |
| High spike | 0.800 | 0.817 | 1.0 | 1.1 | |
| Ba | Low spike | 0.375 | 0.385 | 2.1 | 0.0 |
| High spike | 2.00 | 2.02 | 0.5 | 2.4 | |
| Pb | Low spike | 0.375 | 0.368 | 1.5 | 0.4 |
| High spike | 2.00 | 2.01 | 1.5 | 0.8 | |