| Analyte/ Metal analyzed | Certified Reference Materials (CRMs) for trace metals in biological tissues | Certified values | Values obtained in this study |
| Mercury (Hg) | NRCC-DORM-2 Dogfish Muscle National Research Council of Canada (NRCC) Ottawa, Canada | 4.64 ± 0.26abc (μg・g−1/mg・kg−1) | 0.057 ± 0.010 (mg/kg) |
| Mercury (Hg) | NRCC-DORM-4 Fish Protein National Research Council of Canada (NRCC) Ottawa, Canada | 0.410 ± 0.055d (mg/kg) | 0.057 ± 0.010 (mg/kg) |