The ability of water hyacinth (Eichhornia crassipes) to adsorped polycyclic aromatic hydrocarbons from contaminated soil leachate was examined. Results obtained from analysis using GC/FID indicated that naphthalene (8.350 ?g/g) was the overall highest polycylic aromatic hydrocarbon adsorped at pH 4.0, while pyrene (0.057 ?g/g) was the least adsorped polycyclic aromatic hydrocarbon overall at pH 6.0. In ascending the pH from 2.0 to 6.0, there wasn’t any trend observed in PAH degradation, though, it was noted that polycyclic aromatic hydrocarbons degradation increased from pH 2.0 to 4.0, and then, sharply decreased at pH 6.0. This results thus lend credence to the fact that E. crassipes is a potential phytoremediator in removing polycyclic aromatic hydrocarbons from contaminated waste streams.
Six limestone sources, oystershell, bone meal and dicalcium phosphate were tested for solu and bioavailability in vitro and in vivo. In the in vitro solubility, 1, 0.5 and 0.25 gram of each som was reacted with 100, 50, 25mls of 12N HCl respectively for 30 minutes. The in vivo bioavai. utilized fasted laying chickens, which were force fed 3. Og calcium from each source. Faecal Pain lasted for 48 hours. Calcium was determined by an atomic absorption spectrophotometer. Result vitro solubility test indicated high solubility rate for dicalcium phosphate (78.9%). Other 5:1:4 produced low solubility values below 40% except for bone ineal. Limestone sources were simi,-:: oystershell. The in vivo bioavailability values of local sources (limestone, oystershell and me meal) were significantly (P < 0.05) higher (87% - 92%) than the imported dicalcium phosa (84.0%). Low solubility of local sources resulted in longer retention time in the GIT, which :-2: the "metering out" effect that produced high bioavailability mean values observed in this Oystershell is universally accepted as a good calcium source for layers. The tested limestone sur was similar to oystershell. It was concluded that any of the sources tested can be used in arz close proximity without fear of adverse effect.
The phytoextraction and risk assessment synergy of Arachis hypogea (groundnut), Zea maize (Corn) and Citrullus colocynthis L. (Melon) was investigated at a mining area contaminated with Cd, Cu, Pb and Zn heavy metals. The metal concentrations in plant matter and soil were determined using AAS. The average pH at 5.2 showed a slightly acidic soil while the total organic content and electrical conductivity were low. The studied metals exceeded the Nigerian FEPA guidelines as well as EU threshold values at the sites. Increase in Cd concentration in the North and South caused a corresponding decrease in plant yield. The maize appreciably accumulated more Pb than melon and groundnut. The phytoplants at the West sampling point accumulated more Zinc and melon grown at the west accumulated highest zinc concentrations of up to 1100 mg/kg. The Presence of Cu metal at low concentrations favoured an equivalent increase in weight of harvested groundnut seed. The Coefficient of Variation (CV) showed a correlation that hyperaccumulators had equivalent higher CV
Original Research Article
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