| Elements concentration (μg/g) | ||||||||||
Ca | Cu | Fe | Pb | Zn | Cr | Cd | Mg | Ni | |||
Average | 1501 | 5.8 | 55.8 | 10.2 | 22.2 | <0.1 | <0.1 | 186.5 | <0.04 | ||
Maximum | 4970 | 58.8 | 667.8 | 14.3 | 92.0 | <0.1 | <0.1 | 236.8 | <0.04 | ||
Minimum | 97.1 | 0.29 | 0.1 | 7.1 | 0.17 | <0.1 | <0.1 | 18.1 | <0.04 | ||