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Articles by I.A. Okoro
Total Records ( 7 ) for I.A. Okoro
  I.A. Okoro , D.E. Okwu and U.S. Emeka
  The Kinetics of sorption and intarparticute diffusivity of crude oil using kenaf (Hibiscus cannabinus L.) plant parts was studied. The amount of crude oil adsorbed increased with time. The amount of crude oil adsorbed were 11. 86, 9.92, 7.54 and 7.10 mg mL 1 for the roots and stems respectively. The fractional attainment of equilibrium, values showed that the stem parts research equilibrium point before the root parts. This study has showed that the sorption of crude oil on kenaf (Hibiscus cannabinus L.) plant parts is particle diffusion controlled. The rate coefficient for particle diffusion were 0.015 and 0.007 mm-1 for the root parts and stem parts, respectively.
  I.A. Okoro , K.K. Dimgba and E.E. Oko
  The effects of domestic waste dumping on rural soil samples on the mineral content (s) of the soil was studied. The use of different chemical extractants to specify the state of each mineral in the soil was also investigated. The results showed that the total mineral elements in various states Viz: Exchangeable, oxidisable and soluble states in the 2 rural soil samples increase significantly when compared to non-dumping soil samples collected 1 km distance away from the two land fill sites within the same locality. Some of the mineral elements: Zinc, manganese, calcium and potassium showed more than tenfold increase in the total mineral elements due to the presence of leachates from the land fills.
  I.A. Okoro , C.I. Oriaku and E.N. Ejike
  Concentrations of lead in street dust in selected cities of Aba, Abakaliki, Enugu and Onitsha were determined. The results showed the overall mean lead concentrations for five streets in each of the four Cities selected for the study; Aba (345.99427.12 mg kg 1), Abakaliki (162.15416.24 mg kg 1), Enugu (322.50824.43 mg kg 1) and Onitsha (291.97834.34 mg kg 1). The lead concentrations for each of these four Cities studies correlated positively with commercial, industrial and vehicle traffic emission in these cities.
  I.A. Okoro and E.N. Ejike
  The crude oil absorption behaviour of chemically modified celluloses was investigated. The result showed that only three out of eleven modified celluloses are effective as crude oil absorbents; benzoyl modified cellulose BMC, toluene diisocyanate cellulose TDC, toluenediisocyanate cellulose blown TDCb. These three crude oil absorbents posses the same functional group; the carbonyl. The IR of these three cellulose absorbents showed the presence of carbonyl group 1425.51 cm 1, 1533.06 cm l and 1535.82 cm l, respectively for BMC, TDC and TDCb. The order of crude oil absorptivity are TDCb > BMC > TDC.
  I.A. Okoro and C.E. Onyereke
  Column chromatography and gas-liquid chromatography were used in the evaluation and characterization of oil extracts from different parts of fluted pumpkin seeds. The results show phospholipids (40-58%), glycolipids (26-36%), free fatty acids (1-6%), free sterols (1-2%), neutral lipids (10-24%) and steryl esters (0.8-4%). The fatty acid profiles showed more than 60% instauration comprising mainly C18 fatty acids. The seed coat oil showed more than 70% saturated. Fatty acids, contributed mainly by C16 and C18 fatty acid. The oil extracts in all the sample showed traces of C18: 3 fatty acids.
  I.A. Okoro and C.A. Okoro
  Lipid content and composition of different parts of fluted pumpkin seeds, were investigated. The percentage yield of oil extracts from the samples were (29.5-37.±0.3 ) and (0.5-25±0.1) for the seeds and seed coats, respectively. The following lipids were identified; phosholipids, glycolipids, sterols, fatty acids and neutralipids. These lipid classes were isolated and identified using different organic extract ants and thin-layer chromatography, respectively. The various RF values of the sample were matrix matched with the standard RF values of known lipids.
  I.A. Okoro and E.N. Ejike
  The ampicillin content (5) if ten different brands of ampicillin capsules in circulation in the onitsha central drug market were determined. Two analytical methods were used; iodiometric and UV-visible spectrophotometric analyses. The results showed that 60% of the different brands of capsules analyzed were within Bp stipulation values where as 40% of the remaining brands of capsules were blow the Bp stipulated values. Two brands; miracillin and polfa brands of ampicillin capsules were completely out of the range of stipulated values. These two brands are therefore, substandard, adulterated and the prevalence of fake, adulterated and substandard ampicillin capsules in this market is a great damager to the health of the entire people of West Africa sub region that depend entirely on this market for their pharmaceuticals.
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