HEAVY METAL ACCUMULATION IN MAIZE (Zea mays L.) GRAIN GROWN ON DIFFERENT DUMPSITE SOILS
Abstract
This study was carried out at the Botanical Garden of the Department of Plant Science and Biotechnology, in Rivers State University (RSU), Port Harcourt, Nigeria with the aim of investigating heavy metal accumulation in maize grain grown on different dumpsite soils. Soils used were collected from three different locations with the control; Njemanze Dumpsite, Mile One Flyover Dumpsite and Chinda by Iwofe Dumpsite and analyzed for the presence of the following heavy metals; Cadmium (Cd), Chromium (Cr), Silver (Ag), Lead (Pb) and Mercury (Hg). Soil from Rivers State University Botanical Garden was used as control soil. The soils were analysed using the American Public Health Association (APHA 3111C) method to determine the heavy metal concentration level. The seeds of maize were sown into polybags containing the different soils and the maize plants were allowed to grow to maturity. The result showed the presence of heavy metals in all soil samples with Mile One Flyover Dumpsite having the highest concentrations (Cd; 46.771, Cr; 61.885, Ag 18.629, Pb; 354.386, Hg; 170.474) and RSU (Control soil) had the least concentrations (Cd; <0.001, Cr; 12.295, Ag; <0.001, Pb; <0.001, Hg; <0.0005) of the metals. The heavy metals in the maize grains of the matured maize plants were analysed. The result showed the maize grains of the plants in the soil from Mile One Flyover Dumpsite had high concentrations while the control soil from Rivers State University had low concentrations except Cr that was slightly high when compared to WHO standard.
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References
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