Table 6 The limits of total metal content (mg/kg total solid (TS)) regarding the standards of certain countries
HMs | Samples | Standards | |||||||
|---|---|---|---|---|---|---|---|---|---|
A1 | A2 | Tunisia | UK | France | EU | Canada | Germany | ||
Class A | Class B | ||||||||
Lead (Pb) | 11.93 | 14.40 | 180 | 200 | 180 | 120 | 150 | 150 | 100 |
Copper (Cu) | 28.50 | 35.01 | 300 | 200 | 300 | 300 | 400 | 100 | 70 |
Zinc (Zn) | 80.20 | 120.41 | 600 | 400 | 600 | 800 | 700 | 400 | 300 |
Nickel (Ni) | 29.90 | 32.50 | 60 | 50 | 60 | 50 | 62 | 50 | 35 |
Cadmium (Cd) | 0.26 | 1.41 | 3 | 1.5 | 3 | 1.5 | 3 | 1.5 | 1.0 |
Chromium (Cr) | 57.49 | 81.30 | – | 100 | 120 | 100 | 210 | 100 | 70 |
Mercury (Hg) | 0.01 | 0.04 | 2 | – | – | 1 | – | 1.0 | 0.7 |