| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Daucus carota | Root | -- | 31.0 | * | |
| Brassica oleracea var. botrytis l. | Flower | -- | 22.0 | * | |
| Allium sativum var. sativum | Bulb | -- | 10.0 | * | |
| Brassica oleracea var. capitata l. | Leaf | 1.0 | 4.0 | 1.0 | Jim Duke's personal files. |
| Malus domestica | Fruit Epidermis | -- | 1.7 | * | |
| Malus domestica | Pericarp | -- | 1.7 | * | |
| Malus domestica | Fruit | -- | 1.5 | * | |
| Brassica oleracea var. sabellica l. | Leaf | -- | 0.7 | -1.0 | * |
| Apium graveolens | Pt | -- | 0.7 | * | |
| Zea mays | Seed | -- | -- | * | |
| Camellia sinensis | Leaf | -- | -- | * | |
| Nicotiana tabacum | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |