| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Camellia sinensis | Shoot | 2100.0 | 2300.0 | * | |
| Carthamus tinctorius | Flower | 0.07 | 0.31 | * | |
| Brassica oleracea | Stem | -- | 0.04 | * | |
| Mentha spicata | Leaf | -- | -- | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. | |
| Camellia sinensis | Leaf | -- | -- | * | |
| Vaccinium corymbosum | Fruit Juice | -- | -- | * | |
| Mentha spicata | Essential Oil | -- | -- | * | |
| Citrullus lanatus | Fruit Juice | -- | -- | * |