August 2011
The corrosion behavior of sputter-deposited ternary W–Zr–(15–18)Cr alloys in 12 M HCl
New series of amorphous or/and nanocrystalline W–Zr–(15–18)Cr alloys are successfully prepared by direct current (DC) magnetron sputtering. The role of alloy-constituting elements on the corrosion behavior of the W–Zr–(15–18)Cr alloys is studied by corrosion tests and electrochemical measurements in 12 M HCl solution open to air at 30°C. All the examined sputter-deposited...
August 2011
Monitoring metals pollution using water and sediments collected from Ebute Ogbo river catchments, Ojo, Lagos, Nigeria
The levels of Cu, Pb, Cd, Zn and Ca in water and sediments collected from the Ebute Ogbo River catchments, Ojo, Lagos, Nigeria were determined by flame atomic absorption spectrometry. The samples were collected in year 2008 and 2009. The results obtained showed a decrease in the Cd, Pb and Ca levels in water samples for 2009 compared to year 2008. However, Cu and Zn levels were in the increase. Nevertheless, metals...
August 2011
Some hydrazone derivatives as corrosion inhibitors for iron in 3.5% H3PO4 solution
The inhibition of corrosion of pure iron in 3.5% H3PO4 by some hydrazone derivatives has been investigated by weight loss and galvanostatic polarization techniques. The inhibition efficiency was increased by increasing inhibitor concentration and decreased by rise in temperature. Polarization studied revealed that these compounds behave as mixed-type inhibitors. The inhibition action of hydrazone derivatives was...
August 2011
Tannins and other phytochemical of the Samanaea saman pods and their antimicrobial activities
Preliminary phytochemical screening of n-hexane extract of Samanea saman(Mimosaceae) pods revealed a moderate presence of the major secondary metabolites. Extraction and concentration of the S. saman pods with 70% aqueous acetone yielded the characteristic reddish brown solid tannins. Qualitative and quantitative analysis showed that the tannins were of condensed (catechol) type and about 7.9% (0.079...
August 2011
Removal of Pb (II) in aqueous solution using acid activated carbons prepared from cola edulis shell (Alocaceae), pentaclethra macrophylla husk (Mimosaceae) and aucoumea klaineana sawdust (Burseraceae)
The present research was undertaken to study the potential efficiency as adsorbents of three acid activated carbons, prepared from plant biomass of colas edulis shell (CAH), pentaclethra macrophylla husk (GAH) and aucoumea klainenea sawdust (QAH), for the removal of Pb (II) ions from aqueous solution, by the means of batch technique. The study was managed using pH, concentration of lead solution, adsorption...
August 2011
Spectrophotometric and thermodynamic studies of the charge transfer complexation of nitroimidazoles with chloranilic acid following metal hydride reduction
The spectrophotometric and thermodynamic properties of the charge-transfer (CT) complexation formed between reduced nitroimidazoles and chloranilic acid has been carried out. The possibility of room temperature reduction of metronidazole and tinidazole via hydride transfer using LiBH4 and NaBH4 was examined and the physicochemical properties of the resulting complex of the reduced nitroimidazoles...
August 2011
Comparative study of corrosion inhibition of aluminium alloy of type AA3003 in acidic and alkaline media by Euphorbia hirta extract
The inhibitive effect of leaf extract of Euphorbia hirta on aluminium corrosion in HCl and NaOH solutions were studied using gravimetric technique at 30 and 60°C. Results obtained showed that the leaf extract functioned as effective and excellent inhibitors in the acidic and alkaline media. Also, the leaf extract suppressed the corrosion reaction in both media. Inhibition efficiency of the extract was...
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