| Elements concentration (μg/g) | ||||||||
Ca | Cu | Fe | Pb | Zn | Cr | Cd | Mg | Ni | |
Average | 1024 | 6.2 | 13 | 10 | 15 | <0.1 | <0.1 | 191.7 | <0.04 |
Maximum | 2348 | 30 | 36 | 13 | 37 | <0.1 | <0.1 | 204.3 | <0.04 |
Minimum | 339 | 1.4 | 1.1 | 4.1 | 5.7 | <0.1 | <0.1 | 167.8 | <0.04 |