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Articles by E.K. Ossai
Total Records ( 4 ) for E.K. Ossai
  Chukwujindu M.A. Iwegbue , S.O. Nwozo , E.K. Ossai and G.E. Nwajei
  Concentrations of cadmium, lead, chromium, nickel, copper, manganese and zinc in six brands of fruit drinks was investigated. The concentration of the heavy metals showed appreciable (p<0.05) variability within a brand except for Pb and Zn in orange brand. However, apparent and significant variability exist when brands are compared. The mean levels of the studied metals varies between 2.29-18.29 ppm for Fe, 1.41-7.19 ppm for Cu, 0.002-0.89 ppm for Cr, 0.06-1.93 ppm for Pb, 0.21-1.00 ppm for Ni, 0.006-11.29 ppm for Mn, 0.69-1.25 ppm for Zn and 0.002-0.49 ppm for Cd, the levels of these metals exceeded statutory safe limits except for Mn, Zn and Fe.
  J.O. Otutu , D. Okoro and E.K. Ossai
  The preparation and properties of a series of dis-azo dyes derived from p-aminophenol is described. The influence on colour, dyeing fastness properties of the dyes on synthetic polymer-fibres is reported. Most of the dyes synthesized afford better light fastness and better wet (wash, perspiration) fastness on PET than on nylon 6 fabric. The structure of each compound was confirmed by using infrared, UV-VIS and elemental analysis.
  J.O. Otutu , E.K. Ossai and S.U. Ameuru
  In this study, the synthesis and application of some new disazo disperse dyes derived from 2-chloro-4-methylaniline and 3-aminophenol on nylon 6 fabric are described. The dyes were synthesized via diazotisation of 2-chloro-4-methylaniline using sodium nitrite in an acid (H2SO4) medium and coupling the diazonium salt solution produced with 3-aminophenol to give an intermediate azo compound. The amino azo intermediate was subjected to further diazotisation reaction and coupling with 1-naphthylamine, 3-chloroaniline, 4-chloroaniline, 4-hydroxybenzoic acid, 1,3-dihydroxybenzene and 2-chloroaniline to afford the six disazo disperse dyes. The dyes were characterized by spectral methods (IR, NMR and UV-visible). The results of the fastness tests showed that the light, rubbing and washing fastness of the nylon dyeings using the pressure dyeing method were higher compared with those obtained through normal dyeing method. The results of the study, thus showed that the fastness performance of disperse dyes on nylon fibre could be enhanced by using the pressure dyeing method.
  E.K. Ossai
  In this study five nuts, groundnut (Arachis hypogea), coconut (Cocos nucifera), nutmeg (Myristica fragrans), walnut (Juglans nigra) and Afican nutmeg (Monodora mynstica) were investigated for the following metals: potassium, sodium, calcium, iron, zinc, lead, chromium and selenium using Perkin Elmer 3110 Atomic Absorption Spectrophotometer. Maximum amount of sodium was found in coconut (1685.86±80.6 mg/kg) and the lowest in African nutmeg (34.13±2.5 mg/kg). The highest Potassium and magnesium concentrations occurred in walnut at 3110.3±40.5 and 1164.4±55.6 mg/kg, respectively whilst the least potassium and magnesium was in African nutmeg (42.25±3.5 mg/kg) and nutmeg (4.56±0.06 mg/kg), respectively. Calcium was found highest in walnut (910.25±50.3 mg/kg) and lowest in African nutmeg (7.26±0.5 mg/kg). For iron and zinc the highest value occurred in walnut at 30.24±2.1 and 19.36±2.3 mg/kg, respectively and the lowest value for iron (6.25±0.4 mg/kg) and zinc (1.25±0.03 mg/kg) were for African nutmeg and nutmeg respectively. Apart from nutmeg that has Na/K ratio of 1.505 the other nuts had Na/K ratio of less than 1 with walnut having the lowest value. Thus it can be concluded that eating of walnuts may be beneficial for hypertensive individuals as it is rich in potassium which eliminates sodium which is highly implicated in elevation of blood pressure.
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