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Articles by G.O. Adewuyi
Total Records ( 3 ) for G.O. Adewuyi
  J.O. Babayemi , G.O. Adewuyi , K.T. Dauda and A.A.A. Kayode
  Local production of ash-derived alkali was assessed in this review. Detailed information on local production of ash-derived alkali is rare in literature. Hence, the technologies, materials, probable criteria for selection of materials, processes, use, limitations, problems and areas needing further research in the local production of alkali were assessed. Visitation was made to some traditional alkali-producing factories as well as interaction with other local alkali producer. The traditional technology was found very interesting, while the corresponding laboratory set-up showed an improvement over the traditional one. Local production of potash-an impure form of ash-derived alkali, was observed to be a cheap alternative source of this much needed chemical used in the production of soap and other alkali-based products.
  T.O. Etchie , A.T. Etchie and G.O. Adewuyi
  Principal Component Analysis (PCA) was used to identify the source of contaminants in Ubeji settlement. The contaminants assessed are oil and grease, TPH and related heavy metals (Cd, Cr, Cu, Ni, Pb and Zn). A total of 48 groundwater, 100 surface water, 160 soil and 100 sediment samples were collected from the study site from March to August, 2011. Measurements of oil and grease and TPH in samples were done gravimetrically, while atomic absorption spectrophotometry was used for determination of heavy metals. The results show significant contamination, as TPH levels in groundwater and surface water range from 22 to 96 mg L-1, while soil and sediment levels range from 600 to 2300 mg kg-1. Also, Cd, Cr and Pb levels in the groundwater and surface water range from 0.02 to 0.47, 0.51 to 1.3 and 1.7 to 4.1 mg L-1, respectively while soil and sediment levels range from 0.04 to 0.48, 28 to 66, 45 to 69 mg kg-1, respectively. However, Cu, Ni and Zn are within safe limits. PCA revealed that the source of the contaminants is a refinery and petrochemical company located close to the settlement.
  G.O. Adewuyi and M.T. Osobamiro
  The knowledge of chemical forms of association of toxic metals is important in understanding metal mobility and the potential risk of metal contamination in the soil. This study determined distribution, availability and mobility of Mn, Fe, Ni, Zn and Pb in the soil samples from arable and plantation plots of a farm settlement in South-Western, Nigeria. Heavy metals in the representative soil samples collected were sequentially extracted into seven fractions and concentration of the extracted metals was determined using Atomic Absorption Spectrophotometer (AAS). The range of heavy metals extracted from each of the seven soil fractions in percentages are as follows; soluble exchangeable (0.50-1.80), surface adsorbed (0.80-5.10), organic matter (3.30-17.9), Mn oxide (6.00-27.9), poor crystalline Fe oxide (10.3-25.4), crystalline Fe oxide (14.6-28.5) and residual (21.3-53.1). Available metals in the studied soils ranges between 6.47-10.9, 241-481, 1.34-2.39, 12.9-24.1 and 1.04-2.37 for Mn, Fe, Ni, Zn and Pb, respectively, while mobility factors of all the metals studied were #0.257. In the two agro-ecosystems (oil palm and arable), levels of heavy metals in available forms do not differ significantly in both seasons. Though, majority of the extracted toxic metals are found in oxides and the residual fractions and as such, may not pose environmental risk considering their general relatively low availability and mobility factors. Nevertheless, soils from this study area should be effectively managed to prevent release of occluded heavy metals into the available form for plant uptake.
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