| Element | Type of CRM | Value of CRM mg/kg | Pb mg/kg | SD | RSD% | Recovery% |
| Pb | IAEA-Soil-7 | 60 ± 8 | 56.8 | 2.8 | 5.7 | 94.9 |
| Pb | IAEA_336_Lichen | 4.9 ± 0.6 | 4.1 | 0.23 | 8.97 | 83.7 |