Mixing water is very vital for development of concrete and /or mortar. It can also be a source of aggressive ions in the cured concrete/ mortar. This study investigated the effect of mixing water on performance of cement mortar made from selected Ordinary Portland cement (OPC) and Portland pozzolana cement (PPC). Test cements were sampled from three local cement manufacturing plants while mixing water was randomly sampled from different construction sites in Kajiado, Machakos and Nairob...
ABSTRACTGold mohur -Delonixregia, Tamarind - TamarindusindicaandC amel foot Pilostigmathonningii are tropical seeds reported to be native to Madasgasca, now they grow in every frost free nation across the world Based on the compositional analysis, the three seeds are rich in nutritional components especially proteins, oil and dietary fiber. The three seeds are rich in Glutamine, Aspartate, Leucine, Lysine, Arginine and valine. This result support th...
ABSTRACTZinc Oxide (ZnO) nanowires with hexagonal structure were successfully synthesized by chemicalbath deposition technique. The obtained nanowires were characterized by scanning electronmicroscope (SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) andspectrophotometer. The SEM micrographs revealed the morphology of ZnO nanowires withdiameter between 170.3 and 481nm and showed that the pH of the bath solution, 8.1 is theoptimized value to form ZnO nanowires with...
ABSTRACTZinc Oxide (ZnO) nanowires with hexagonal structure were successfully synthesized by chemicalbath deposition technique. The obtained nanowires were characterized by scanning electronmicroscope (SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) andspectrophotometer. The SEM micrographs revealed the morphology of ZnO nanowires withdiameter between 170.3 and 481nm and showed that the pH of the bath solution, 8.1 is theoptimized value to form ZnO nanowires with...
ABSTRACTThe kinetics and mechanisms of the redox reactions of μ-oxo-bridged iron(III) complex ionNa4[(FeEDTA)2 O].12H2O denoted as Fe2 O4+, with the thiols-2 mercaptobenzothiazole(MBSH), 2- mercaptophenol(PhSH), 2-mercaptoacetic acid (MSH), and l-cysteine (RSH) have been investigated in aqueous perchloric acid medium at [H+]=1×10-4 mol dm-,3,I=0.05mol dm-3(NaClO4) and at T=27.0±0.1oC. The reactions were monitored under pseudo-first order condition .The rate of reaction&n...
ABSTRACTDried and pulverised leaves of A. boonei De Wild (Apocynacea) were extracted using methanolfor 48 h. The methanol extract obtained was defatted using n-hexane and fractionated usingethylacetate. The ethyl acetate fraction of the extract was subjected to vacuum liquidchromatography (VLC) in silica gel using gradients of hexane-ethyl acetate. The VLC fractionswere further separated on Sephadex LH-20. A total of 10 compounds were successfully isolatedand purified using the reverse p...
ABSTRACTDried and pulverised leaves of A. boonei De Wild (Apocynacea) were extracted using methanolfor 48 h. The methanol extract obtained was defatted using n-hexane and fractionated usingethylacetate. The ethyl acetate fraction of the extract was subjected to vacuum liquidchromatography (VLC) in silica gel using gradients of hexane-ethyl acetate. The VLC fractionswere further separated on Sephadex LH-20. A total of 10 compounds were successfully isolatedand purified using the reverse p...
ABSTRACT Cr (VI) is a well-known highly toxic metal. This project focuses on the removal of Cr (VI) from contaminated water using activated carbon entrapped in calcium alginate beads. Activated carbon used for this work was prepared from an organic waste material called walnut shell by carbonization using phosphoric acid as an activating agent. 0.5g of activated carbon was added to 10mL of 4% sodium alginate solution.The mixture was promptly dropped into 3.5% aqueous...
ABSTRACTThis study was undertaken to determine the natural raaionuclides activities of 238U, 232Th, and 4°Kas contaminants and their distribution from dust particles obtained from selected qua1Ties in Ekitiand Ondo States. This work was performed in four quarries sites located in Ekiti and Ondo Statesand a control sample. The radioactivity concentrations of the natural radionuclides (238U. 232Th and4°K) in the collected quarries dust samples were determined by gamma ray spectromet...
ABSTRACTThree species of garden egg namely Solanum aithiopicum, Solanum aubergine and Solanumanguivi processed into raw and boiled powdered flour, samples were taken for their nutritionaland mineral components using standard analytical methods. Proximate composition determinedinclude total ash, moisture content, crude fibre, crude protein, crude fat and carbohydrate bydifference, the mineral components determined are P, Fe, Mg, Na, Mn, Zn, Ni and Cu. Theproximate analysis (%) shows...
ABSTRACTGold mohur -Delonixregia, Tamarind - TamarindusindicaandC amel foot - Pilostigmathonningii are tropical seeds reported to be native to Madasgasca, now they grow in every frost free nation across the world .. Based on the compositional analysis, the three seeds are rich in nutritional components especially proteins, oil and dietary fiber. The three seeds are rich in Glutamine, Aspartate, Leucine, Lysine, Arginine and valine. This result support the main aim of ...
The concentrations of Ni, Mn, Cd, Cu, Zn, Pb and Cr, were determined in some pastas consumed in Nigeria, with a view to providing information on the dietary intakes of heavy metals and exposure of humans to toxic metals. The concentrations of these seven (7) elements were determined by atomic spectrometry after nitric acid/perchloric acid digestion. The concentrations of the metals (µg/g) in the locally manufactured pasta samples were in the following ranges: Ni (0.109 - 0.344); Mn (0....
ABSTRACTThe synthesis of ten new alkynylated derivatives of angular phenoxazine and alkynylatednaphthoquinone was thoroughly investigated. The first intermediate, 6-chloro-5Hbenzo[a]phenoxazin-5-one was obtained by the condensation of 2-aminophenol with 2,3-dichloro-1,4- naphthoquinone in the presence of anhydrous sodium tricarbonate (IV) .Thereafter, the intermediate and 2,3-dichloro-1,4-naphthoquinone were each suggested toSonogashira cross–coupling reaction under copper-, amine-, ...
ABSTRACTThe concentration of six heavy metals and six of sixteen (16) US EPA priority polycyclic aromatichydrocarbons (PAHs) in water, fish and sediment samples of the confluence of rivers Niger andBenue were investigated in triplicates using atomic absorption spectrophotometer (AAS) for theheavy metals determination and gas chromatography coupled with mass spectrometer detector forthe PAHs after acid digestion of the samples for heavy metals,liquid-liquid and solid-liquidextraction for ...
ABSTRACT Magnetically recoverable Pd/Fe3O4-catalyzed Hiyama cross-coupling reactions of 6-Bromo-5H-benzo[a]phenothiazin-5-one, 6-Bromo-5H-naphtho[2,1-b]pyrido[2,3-e][1,4]oxazin-5-one and 11-Amino-6-bromo-9-thio-5H-naphtho[2,1-b]pyrimido[5,4-e][1,4]oxazin-5-one (as intermediates) with 2-(Dimethylsilyl)pyridine and Dimethyl(2-thienyl)silanol were investigated. The intermediates were prepared by the reactions of 2-Aminothiophenol, 2-Aminopyridin-3-ol and 4,5-Diamino-6-hydrox...