Table 5.
Soxhlet extraction-GC/MS method validation parameters for the 16 EPA PAHs in SRM 1649b (n=7).
| PAH | Experimental mean (ng)a | NIST-certified value (ng)a | RSD (%) | Recovery (%) | Accuracyb (%) |
|---|---|---|---|---|---|
| Naph | 67.3 ± 18.6 | 391 ± 35 | 33.8 | 17.2 | −82.8 |
| Acy | 20.2 ± 5.9 | 79.9 ± 9.5 | 35.9 | 25.2 | −74.8 |
| Ace | 25.0 ± 5.4 | 81.6 ± 16.5 | 26.5 | 30.7 | −69.4 |
| FL | 32.6 ± 9.2 | 92.3 ± 14.4 | 34.5 | 35.3 | −64.7 |
| Phe | 1215 ± 331 | 1668 ± 24 | 33.4 | 72.8 | −27.2 |
| Ant | 104 ± 25 | 169 ± 1 | 32.5 | 61.8 | −38.2 |
| Ft | 2392 ± 559 | 2573 ± 32 | 31.0 | 93.0 | −7.05 |
| Pyr | 1914 ± 398 | 2054 ± 57 | 27.6 | 93.2 | −6.79 |
| BaA | 808 ± 148 | 870 ± 20 | 24.3 | 92.9 | −7.13 |
| Chry | 1632 ± 464 | 1256 ± 11 | 37.6 | 129 | 29.9 |
| BbFt + BjFt | 3144 ± 800 | 3260 ± 91 | 33.7 | 96.4 | −3.58 |
| BkFt | 921 ± 319 | 702 ± 20 | 45.9 | 131 | 31.3 |
| BaP | 1019 ± 271 | 1018 ± 98 | 35.2 | 100 | 0.07 |
| IP | 1109 ± 296 | 1192 ± 65 | 35.4 | 93.1 | −6.89 |
| DBahA + DBacA | 507 ± 176 | 241 ± 4 | 45.9 | 363 | 263 |
| BghiP | 2143 ± 580 | 1777 ± 32 | 35.8 | 120 | 20.6 |
| Averagec | — | — | 34.9 | 120 | |36.8| |
aExpanded uncertainty about the mean, with coverage factor, k = 2; baccuracy = (experimental value − certified value) × 100/certified value; cexcept Naph, Acy, Ace, and FL.