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Articles by E.M. Ogbo
Total Records ( 2 ) for E.M. Ogbo
  E.M. Ogbo and J.A. Okhuoya
  The effect of Pleurotus tuber-regium on the bioavailability of metallic elements in crude oil contaminated soils was investigated. The fungus was grown in crude oil contaminated soils amended with sawdust, shredded banana leaf blades, NPK-nitrogen, phosphorus and potassium and poultry litter. The soils were analyzed for heavy metal content; total and exchangeable (Fe, Mn, Co, Ni, Zn, Cu, Pb, Cr, Cd, Hg and As). The mushroom caused dissolution of the metallic elements analyzed for, increasing concentration of heavy metals in their bio-available states. The addition of cellulosic wastes and fertilizers to crude oil contaminated soils affected the ability of the fungus to release metals from their bound states. The substrates with poultry litter recorded the highest bioavailability factor and control soils that had no fungal treatment recorded the least. Metals like nickel and iron recorded low bioavailability factors both in crude oil contaminated soils without and with fungal treatment. Other metals like manganese and cobalt recorded high bioavailability factors in soils with or without the mushroom. In conclusion the growth of the fungus Pleurotus tuber-regium in crude oil contaminated soil caused the release of metals into their bio-available states. The solubilization of metals by the fungus was affected by substrate composition with poultry litter having the highest impact on solubility of metals. The fungus can be used for heavy metal harvesting of some metals from contaminated sites. Pleurotus tuber-regium has the potential of increasing metal toxicity in soils by increasing the bioavailability of some metals needed in trace quantities.
  E.M. Ogbo and J.A. Okhuoya
  In this study, the fate of Pleurotus tuber-regium harvested from crude oil contaminated substrates is investigated with regard to the bio-absorption of heavy metals specifically-Fe, Mn, Co, Ni, Zn, Cu, Pb, Cr, Cd, Hg and As. The fungus was grown in crude oil contaminated soils amended with poultry litter, NPK-fertilizer, sawdust and shredded banana leaf blades. Harvested fruit bodies were digested with acids and heavy metal content determined. The metallic element content of contaminated soil was low for elements analyzed for with reference to recommended limits for them in normal soils. The only metal that was relatively higher than permissible concentration in soil was chromium. The contaminated soil was deficient of essential metallic elements like Zn, Mn and Cu. There was further reduction of these metallic elements caused by their uptake by the fungus. Cadmium, mercury and arsenic were not detected in the soils and fruit bodies of the mushroom. The transfer of metals from the soils to the mushroom varied with type of metal, its concentration and substrate composition. The transfer factor of the various metals varied from 10.47 in zinc to 0.31 in iron. Fruit bodies from substrates with poultry litter accumulated Fe, Pb and Cr to toxic levels. Mushrooms harvested from crude oil contaminated sites should be analyzed before consumption and properly disposed by incineration or recycling if concentration of metals is too high. The fungus can be used as a bio-indicator of heavy metal pollution and fungal remediated sites can be augmented with micronutrients.
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