Heavy metals | Maximum allowable in irrigation water | Values for water at sampling site (mg/I) | Values for soil at various depth | |
0 - 15 cm | 15 - 30 cm | |||
Pb | - | 0.05 | 0.8 | 0.3 |
Cu | 0.2 | 0.05 | 0.1 | 0.2 |
Zn | Up to 5.0 | 0.04 | 1.8 | 1.0 |
Mn | 0.2 | 0.08 | 2.4 | 1.7 |
Ni | 0.2 | 0.07 | 2.1 | 1.1 |
As | 0.1 | 0.05 | 1.6 | 0.8 |
Cr | 0.1 | 0.09 | 1.0 | 0.5 |
Fe | 0.01 | 0.2 | 0.8 | 0.6 |