Abstract
This study evaluated the heavy metal concentration in plant tissues of Jatropha curcas grown in crude oil contaminated soil in Asaba, Delta State, Nigeria, in 2010. The soil treatments included 0.0, 2.0 4.0, 6.0, 8.0, and 10.0% w/w oil contamination. The results showed a significant buildup of heavy metals including iron, zinc, cadmium, copper, manganese, lead, chromium, and nickel in contaminated soils when compared to the uncontaminated subplots (p ≤ .05). The amounts of metals observed in this study are below tolerable limits according to the Food and Agriculture Organization of the United Nations and Federal Environmental Protection Agency of Nigeria. A gradual accumulation and biomagnifications of these nonbiodegradable elements in plants can lead to dangerous or lethal levels with inherent health risks for humans and other organisms.
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