| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Brassica napus var. napobrassica | Root | 100.0 | 965.0 | -0.2 | USDA's Ag Handbook 8 and sequelae) |
| Brassica oleracea var. sabellica l. | Leaf | 320.0 | 2060.0 | -0.9 | * |
| Brassica oleracea var. botrytis l. | Flower | 280.0 | 3615.0 | * | |
| Brassica rapa | Leaf | 90.0 | 1923.0 | -1.0 | USDA's Ag Handbook 8 and sequelae) |
| Brassica oleracea var. viridis l. | Leaf | 210.0 | 3442.0 | 0.3 | * |
| Brassica rapa | Root | 110.0 | 1350.0 | 0.5 | * |
| Brassica oleracea var. botrytis l. | Leaf | 340.0 | 3652.0 | 0.5 | * |
| Brassica chinensis | Leaf | 90.0 | 1923.0 | -1.0 | * |
| Cajanus cajan | Seed | 1860.0 | 2720.0 | -0.4 | * |
| Calathea allouia | Root | 1415.0 | 1560.0 | 0.8 | * |
| Capsella bursa-pastoris | Plant | -- | -- | * | |
| Capsicum frutescens | Fruit | 240.0 | 1958.0 | 1.2 | USDA's Ag Handbook 8 and sequelae) |
| Capsicum annuum | Fruit | 100.0 | 1364.0 | 0.5 | USDA's Ag Handbook 8 and sequelae) |
| Carica papaya | Fruit | 10.0 | 179.0 | -1.0 | * |
| Carum carvi | Seed | 3610.0 | 4005.0 | -0.1 | Revised USDA data received 1993. |
| Castanea sativa | Seed | 468.0 | 1028.0 | -0.8 | * |
| Castanea mollisima | Seed | 1014.0 | 1804.0 | -0.6 | * |
| Castanea dentata | Seed | 893.0 | 1589.0 | -0.7 | * |
| Ceratonia siliqua | Seed | -- | 4700.0 | 0.1 | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. |
| Chenopodium album | Leaf | 490.0 | 3121.0 | 0.0 | * |