| Elements concentration (μg/g) | ||||||||
Ca | Cu | Fe | Pb | Zn | Cr | Cd | Mg | Ni | |
Average | 2159 | 3.4 | 106 | 9.2 | 27 | <0.1 | <0.1 | 172 | <0.04 |
Maximum | 3884 | 8.4 | 367 | 11 | 47 | <0.1 | <0.1 | 197 | <0.04 |
Minimum | 777 | 0.6 | 1.4 | 4.8 | 7.4 | <0.1 | <0.1 | 116 | <0.04 |