African Journal of Biotechnology Vol. 4 (13), pp. 1521-1524, Special Review 2005          
ISSN 1684–5315 © 2005 Academic Journals

Review

Risk and health implications of polluted soils for crop production

OKORONKWO NE¹*, IGWE JC¹, ONWUCHEKWA EC²

¹Department of Industrial Chemistry, Abia State University, Uturu, Nigeria.

²Department of Microbiology, Abia State University, Uturu, Nigeria.

*Corresponding authors E-mail: Tel: 08035626322, nnennaejijeokoronkwo@yahoo.com.

Accepted 15 September, 2005

Studies of polluted soils have shown heavy metals contamination of the soils as well the uptake of these toxic elements by plants. Consequently, there are reasons for concern over elevated concentration levels of heavy metal/toxic elements in polluted soils. This can ultimately result in high human and animal exposure to these toxic elements through food-chain transfer, ingestion of wind blown dust or direct ingestion of soils. The toxic effects caused by excess concentrations of heavy metals in living organisms include competition for sites with essential metabolites, replacement of essential ions, reactions with –SH groups, damage to cell membranes and reactions with the phosphate groups.

Key words: Polluted soils, toxic/heavy metals, plant uptake, health.