| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Apium graveolens | Stem | -- | 3.4 | * | |
| Brassica oleracea var. botrytis l. | Flower | -- | 1.4 | * | |
| Brassica oleracea var. sabellica l. | Leaf | -- | 3.8 | -0.5 | * |
| Brassica oleracea var. capitata l. | Leaf | 2.8 | 3.3 | -0.9 | Jim Duke's personal files. |
| Daucus carota | Root | -- | 2.8 | * | |
| Malus domestica | Fruit Epidermis | -- | 0.6 | * | |
| Malus domestica | Fruit | 0.3 | 3.0 | * | |
| Malus domestica | Pericarp | -- | 0.6 | * | |
| Moringa oleifera | Root Bark | -- | -- | * | |
| Moringa oleifera | Bark | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Spinacia oleracea | Leaf | -- | 6.1 | 1.4 | * |
| Zea mays | Seed | -- | 3.4 | * |