| Elements concentration (μg/g) | ||||||||
Ca | Cu | Fe | Pb | Zn | Cr | Cd | Mg | Ni | |
Average | 1490 | 6.8 | 60 | 11 | 25 | <0.1 | <0.1 | 191 | <0.04 |
Maximum | 4006 | 16 | 387 | 27 | 65 | <0.1 | <0.1 | 213 | <0.04 |
Minimum | 132 | 2.3 | 0.76 | 9 | 1.7 | <0.1 | <0.1 | 97 | <0.04 |