| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Alisma plantago-aquatica | Plant | -- | -- | * | |
| Coffea arabica | Seed | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Pimenta dioica | Plant | -- | -- | * |