Cu | Fe | Cd | Pb | Zn | Ni | |
Measured value | 3.96 ± 0.08 | 169 ± 4.6 | 0.78 ± 0.03 | 1.15 ± 0.04 | 128 ± 8.00 | 0.91 ± 0.11 |
Certified value | 4.02 ± 0.33 | 171 ± 4.9 | 0.82 ± 0.16 | 1.19 ± 0.18 | 137 ± 13.00 | 0.93 ± 0.12 |