| Samples | Source | Mercury | Copper | |||
| Concentration (μg∙mL−1) | RSD (%) | Concentration (μg∙mL−1) | RSD (%) | |||
| Food | Fish | Laitta | 0.70 ± 0.03 | 4.3 | 0.25 ± 0.005 | 2.1 |
| Shrimp | 0.31 ± 0.02 | 6.4 | 0.43 ± 0.02 | 4.6 | ||
| Vegetables | Radish | 0.08 ± 0.005 | 5.9 | 0.20 ± 0.01 | 4.9 | |
| Cabbage | 0.07 ± 0.003 | 3.9 | 0.44 ± 0.008 | 1.8 | ||