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Recommended limit for selected PTMs in irrigation water, and soil for agriculture.
| Matrix | Recommended limit for the selected PTMs | ||||||
|---|---|---|---|---|---|---|---|
| As | Cd | Cr | Pb | EC (µS cm−1) | pH | ||
| WHO | Irrigation water | 0.1 | 0.01 | 0.1 | 5.0 | 400–600 | 6.5–8.5 |
| WHO | Soil | – | 0.48 | 11.0 | 2.0 | – | – |
| WHO | Vegetables | – | 0.2 | 2.3 | 0.3 | – | – |
| FAO | Irrigation water | – | – | – | – | 400–600 | 6.5–8.4 |
