| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Urtica dioica | Leaf | 1.4 | 7.8 | 1.3 | ACTA AGRIC SCAND SUPPL 22: 1980 |
| Vaccinium vitis-idaea | Fruit | 0.1 | 0.7 | -0.6 | * |
| Vaccinium myrtillus | Fruit | -- | 0.1 | -1.2 | ACTA AGRIC SCAND SUPPL 22: 1980 |
| Vitis vinifera | Fruit | 0.1 | 0.6 | -0.7 | ACTA AGRIC SCAND SUPPL 22: 1980 |
| Zingiber officinale | Root | -- | 2.0 | 1.3 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Zingiber officinale | Rhizome | -- | 2.0 | * |