FACULTY OF AGRICULTURE
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Item Heavy metal accumulation in Corchorus olitorius L. and Talinum fruticosurp (Jacq) Wild grown on soil from abandoned battery dump site in lle-lgbon, Oyo State, Nigeria(2017) Fayinminu, O. O.; Oyelakin, O. S O. S; Idowu, O. D; Fadina, O.O.Plants are essential component of the natural ecosystems and terrestrial food chains. They have the potential to accumulate toxic metals when grown on such polluted soil, which could have negative health effects on man and livestock, if consumed. This study was conducted to evaluate the heavy metal accumulation in Corchorus olitorius and Talinum fruticosurp grown on soil from abandoned automobile battery dumpsite in lle-lgbon, Lagelu Local Government Area, Oyo State, Nigeria. Heavy metals (Pb, Cd, Mn, Fe and Ni) concentrations in the soil, and rool and shoot of Corchorus olitorius and Talinum fruticosurp were evaluated and the Transfer Factor (TF) of heavy metals in plants were determined. The experiment was laid out in a completely randomized design with four replicates. The treatments were battery polluted soil from lle-lgbon and soil (control) from Teaching and Research Farm, University of Ibadan, Nigeria. Seeds and stein cuttings of C. olitorius and T. fruticosurp. respectively were planted into 5 kg pot of polluted and control soils. Heavy metal concentrations of the soil, shoot and root were analysed in the laboratory. Heavy metal concentrations of polluted soil were: Pb (2928 mg/ kg), Cd (17.4 mg/kg), Mn (4482 mg/kg) and Fe (1877 mg/kg) as compared to the control: Pb (124 mg/kg). Cd (undetected), Mn (5368 mg/kg) and Fe (25.8 mg/kg). Heavy metals in the root and shoot samples of Corchorus olitorius and Talinum fruticosurp were Pb and Fe. Cadmium, Fe and Pb showed TF> I for both vegetables. The study concluded that vegetables planted around lle-lgbon have high concentrations of Pb and Fe. Even though Fe in the vegetables was below WHO permissible level of 425 mg/kg, Pb concentration (3.0 mg/kg) was beyond WHO/FAO permissible levelItem Bioassay using the water soluble fraction of a Nigerian light crude oil on clarias gariepinus fingerlings(Physiological Society of Nigeria, 2012) Olaifa, F. E.A 96-hour bioassay was conducted using the water soluble fraction of a Nigerian light crude oil sample on Clarias gariepinus fingerlings. 0, 2.5, 5.0, 7.5 and 10 mls of water soluble fractions (WSF) of the oil were added to 1000 litres of de-chlorinated tap water to form 0, 25, 50 , 75 and 100 parts per million representing treatments 1 to 5 respectively. Each treatment had two replicates with fifteen fish per replicate. At the end of the 96-hour period of exposure, the fish were transferred into separate bowls containing fresh water without oil for recovery for ten more days. Heavy metal and total hydrocarbon contents of the water and fish were analyzed at 96 hour and 14 days which marked the end of the recovery period. No mortalities were recorded on all treatments during the 96-hour period. Mortalities were observed between 120 and 144 hours after the onset of the experiment with the maximum number of dead fish (p<0.05) from treatment 5(100 ppm WSF) during the recovery period indicating a delayed response to the WSF by the fish. No mortalities were recorded after 144 hours till the termination of the experiment at 14 days . The 96-hour LC50 could not be calculated since no deaths occured during the period. The Total hydrocarbon contents of the water were 0, 0.026 ,0.316 ,0.297, 0.253 mg/l for treatments 1(0 ppmWSF)) to 5(100ppmWSF) respectively. Lead , iron and cadmium were not detected in water during the study, lead was also not detected in fish muscles from all treatments. The iron contents of all the treatments were lower than the control except for treatment 3(50 ppm WSF). THC concentrations in fish were higher at 96 hours and 14days than in the water indicating bioconcentration in fish and a retention in the fish long after exposure.Item Presence of hydrocarbons and heavy metals in some fish species in the cross river, Nigeria.(2004) Olaifa, F. E.; Ayodele, I. A.The study was undertaken to determine the total hydrocarbon (THC) and heavy metal contents of fish (finfish and shelf fish) in the cross river, Nigeria. Fish samples were collected in the dry (March) and rainy (October) seasons between 2000-2002. The finfish species identified in the study were Synodontis clarias, Sarotherodon galilaeus, Heterotis niloticus, Scholbe mystus, ansorgil and the shelfish were macrobrachium vollenhovonii and tympanotnomus luscalus. Significant difference (P<0.05) existed between finfish andshellfish in both THC and heavy metals contents. The levels of THC in fish exceeded the World Health Organization's limit of 0.0001 ppm by an average of 3.2 and 15.57 mg/kg in fin and shelffish respectively. High concerntrations of vanadium and THC in fish samples were the main indicators of pollution from petroleum sourcesItem Heavy metal contamination of clarias gariepinus from a lake and fish farm in Ibadan, Nigeria(Ibadan Biomedical Communications Group, 2004) Olaifa, F. E.; Olaifa, A. K.; Adelaja, A. A.; Owolabi, A. G.Adult Clarias gariepinus (African Catfish) were purchased from Eleiyele Lake and Zartech fish farm in Ibadan. Water samples were also collected in February (dry season) and June (rainy season), 2002. Gill, bone, intestine, muscle and water samples were analyzed for five metals: manganese, copper, zinc, iron, and chromium by atomic absorption spectroscopy (AAS) in two separate experiments. In each case, two tissues were compared with the levels of the metals in water viz: Gill, bone, and water; intestine, muscle and water. Generally, lower concentrations of the metals were recorded in water than fish tissues. Higher concentrations of zinc than recommended by the Federal Environmental Protection Agency were recorded in the fish during the dry season. Iron was the dominant metal in the muscle while Chromium was the least. Significant differences (p<0.05) were recorded in copper and zinc concentrations in the muscle, intestine and water during the dry and rainy seasons .In gill, bones and water, significant differences (p<0.05) were only recorded for the two stations for copper during the rainy season and only zinc was significantly different (p<0.05) in the dry season. It was concluded that though the heavy metals of interest were present in measurable quantities there were still within safe limits for consumptionItem Production of wine from the fruit pulp of African star apple (Chrysophyllum albidum G.Don,)(Ecological Society of Nigeria, 2014) Jimoh, S.O.; Adeniyi, T.E.; Oladele, A.T.African star apple Chrysophyllum albidum G.Don, (Sapotaceae) is an important forest tree species and valued for its fruits among forest dwellers across West and Central Africa. Utilization efficiency of the fruit pulp in Nigeria is limited to consumption as fruit snack during its season. Hence there are a lot of wastages offruits which are not marketed within few days of harvesting. Processing of the fruit pulp for industrial development may promote better utilization efficiency and sustainable management of the species. The study therefore investigated the potentials of the fruit pulp of the species in wine production. Fruits used for the study were collected from old and young trees at Laniba, Akinyele Local Government Area, Ibadan, Nigeria. Ripe fruits were plucked from young and old trees and the juice extracted from the fruit pulp. The wine was prepared by fermenting the juice, using graded levels of sucrose to produce dry and sweet wines. Chemical, microbial, heavy metals and sensory properties of the wine were determined. Heavy metals concentrations were within the WHO limits. Young and old trees fruit wines contain: Cr (22.74ppm/mg, 20.46ppm/mg), Pb (8.4ppm/mg, 2.4ppm/mg) and Mn (10.8ppm/mg, 9.6ppm/mg) respectively. The ascorbic acid contents were higher in old tree and sweet wine samples than young tree and dry wine samples (3.28 and 3.59%) and (2.06 and 2.11%) respectively. African star apple has good potentials as a raw material for fruit wine production. Food industries may consider the adoption of this indigenous species for fruit wine production