Elements with high molecular weights which are generally toxic in low concentrations to plant and animal life. Those metals wich have densities >5,0 Mg m-3
- Main heavy metals accumulating in the soil are: Boron, Cadmium, Chromium, - Mercury, Nickel and Lead. They are found generally in industrial and urban muds and in garbage sludge.
- It is dangerous for men and animals to consume plants accumulating heavy metals.
- Phytotoxicity is made by roots' direct contact or by absorption.
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