| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Pinus strobus | Leaf | -- | 4530.0 | -1.0 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Solanum tuberosum | Tissue Culture | -- | -- | * | |
| Zea mays | Fruit | -- | -- | * |