| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Capsicum annuum | Fruit | 350.0 | 4774.0 | 0.4 | * |
| Apium graveolens | Pt | 220.0 | 4665.0 | USDA's Ag Handbook 8 and sequelae) | |
| Persea americana | Fruit | 960.0 | 4625.0 | 0.4 | * |
| Cucumis sativus | Fruit | 180.0 | 4557.0 | 0.3 | * |
| Castanea dentata | Seed | 2469.0 | 4395.0 | -1.2 | * |
| Beta vulgaris | Root | 560.0 | 4338.0 | 0.4 | USDA's Ag Handbook 8 and sequelae) |
| Brassica rapa | Root | 350.0 | 4305.0 | 0.4 | * |
| Raphanus sativus | Root | 220.0 | 4265.0 | 0.4 | * |
| Lycopersicon esculentum | Fruit | 30.0 | 4132.0 | 0.2 | * |
| Avena sativa | Seed | -- | 4000.0 | -1.3 | Jim Duke's personal files.* |
| Calathea allouia | Root | 3545.0 | 3900.0 | 0.2 | * |
| Citrus sinensis | Fruit | 30.0 | 3775.0 | 0.0 | * |
| Lycium barbarum | Fruit | -- | 3700.0 | -0.0 | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. |
| Fragaria spp | Fruit | 310.0 | 3677.0 | -0.0 | USDA's Ag Handbook 8 and sequelae) |
| Castanea mollisima | Seed | 2012.0 | 3581.0 | -1.4 | * |
| Triticum aestivum | Seed | 3036.0 | 3542.0 | -1.4 | * |
| Pachyrhizus erosus | Tuber | 380.0 | 3500.0 | -0.7 | * |
| Prunus persica | Fruit | 420.0 | 3402.0 | -0.1 | * |
| Macadamia spp | Seed | 3290.0 | 3385.0 | -1.4 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita pepo | Fruit | 280.0 | 3333.0 | -0.1 | USDA's Ag Handbook 8 and sequelae) |