Open Access Original Research Article

Inhibition of Mild Steel Corrosion in Acidic Medium by Telfairia occidentalis Rind Extract

Inemesit A. Akpan, Okon U. Abakedi, Mfon A. James

Asian Journal of Applied Chemistry Research, Page 1-10
DOI: 10.9734/ajacr/2018/v1i39643

Telfairia occidentalis rind extract has been studied as a potential green inhibitor for mild steel corrosion in 1 M H2SO4 using weight loss and hydrogen evolution methods. The results of the investigation reveal that Telfairia occidentalis rind extract is a good inhibitor of mild steel corrosion in sulphuric acid solution. The inhibition efficiency increases with increase in rind extract concentration but decreases with increase in temperature. The calculated thermodynamic parameters reveal that the corrosion inhibition process was endothermic and spontaneous. Physical adsorption has been proposed for the adsorption of Telfairia occidentalis rind extract onto mild steel surface. The adsorption of the extract on mild steel surface obeys the Langmuir adsorption isotherm. 

Open Access Original Research Article

Physicochemical Properties of Alchornea cordiforlia, Cyperus esculentum and Irvingia gabonensis Seed Oils and Their Applications

Akpe Michael Akomaye, Inezi Faith Patrick

Asian Journal of Applied Chemistry Research, Page 1-7
DOI: 10.9734/ajacr/2018/v1i39656

The physicochemical properties of oils extracted from three locally available plant seeds in Nigeria namely: Alchomea cordiforlia, Cyperus esculentum and Irvingia gabonensis using n-Hexane were determined. The results of the analysis revealed that their % yield were 37.00, 27.50 and 33.00 for A. cordiforlia, C. esculentum and I. gabonensis respectively. Their odour was non-offensive and their colours were reddish, light yellow and milky white for A. cordifolia, C. esculentum and I. gabonensis respectively, making them bright and attractive. The specific gravity of the oils at 25oc was 0.91, 0.94 and 0.92 for A. cordiforlia, C. esculentum and I. gabonensis  respectively. Their flash points in °c were also 155, 159 and 229 respectively, indicating that I. gabonensis is the most thermally stable oil and suitable for frying. The chemical properties for A. cordiforlia, C.esculentum, and I. gabonensis respectively were as follows: Acid values in mgKOH/g were 24.67, 5.33 and 3.73. Peroxide values in mEqKg-1 were 7.26, 9.86 and 2.96. Saponification values in mgKOH/g were 162.13, 179.52 and 238.43. Iodine values in g/100g were 24.62, 11.68 and 3.38. These results indicate that the three seeds are viable sources of oil based on their % yield. They are good for both domestic and industrial use based on their acid, saponification and iodine values. Their properties in most cases compete favorably with palm kernel oil (PKO) which is currently being used for many domestic and industrial purposes in Nigeria especially for the making of paints, soap, cosmetics, lubricant, and varnishes.

Open Access Original Research Article

Biosorption of Pb(II) and Cu(II) from Aqueous Solution Using Chicken Feathers: Thermodynamics and Mass Balance Studies

Salaudeen Abdulwasiu Olawale, Abdulrahman Wosilat Funke, Aliyu Haruna Dede, Yakubu Hajara

Asian Journal of Applied Chemistry Research, Page 1-9
DOI: 10.9734/ajacr/2018/v1i39662

Thermodynamic and mass balance studies of Pb(II) and Cu(II) biosorption from aqueous solution using chicken feathers (CF) were carried out. Thermodynamic parameters such as standard free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) changes were calculated from the data obtained to predict the nature of adsorption by chicken feathers (CF). From the results, entropy changes were positive indicating an increase in disorderliness in the adsorption of Pb(II) and Cu(II) onto the chicken feathers (CF). The negative values of Gibbs free energy and positive values of enthalpy indicated that the adsorption process by CF was spontaneous and endothermic. Data obtained also showed that the percentage Cu(II) and Pb(II) released by CF after digestion at 25 mg/l were higher than those released at 100 mg/l. Finally, FTIR analysis confirmed the presence of carboxyl, hydroxyl, amino and sulphur containing functional groups on CF, with no substantial variation in the spectra obtained before and after adsorption indicating a possible re use of CF.

Open Access Original Research Article

Study on Variation of Polar Metabolites in Control and Water Stressed Gossypium hirsutum L. Using NMR Spectroscopy

Hema Bisht, M. K. Bhatnagar, S. S. Bisht, Arun K. Murthy

Asian Journal of Applied Chemistry Research, Page 1-12
DOI: 10.9734/ajacr/2018/v1i39670

In the present study, the variation in polar metabolites in Gossypium hirsutum L. during water stress was observed by nuclear magnetic resonance spectroscopy (NMR) techniques. Discriminating metabolites were elucidated by 1H NMR measurements and 2D-NMR (COSY and HSQC) techniques. Total 46 polar metabolites were detected in control and water stressed G. hirsutum leaf and stem. Nine metabolites in the leaf while thirteen metabolites in the stem were quantified. Highly significant quantitative variations were noticed, among the metabolites, i.e., glucose, glycinebetaine (GB), alanine in leaf and glycinebetaine (GB), scyloinositol in stem. This change in metabolite profile during water stress in G. hirsutum represents the change in metabolomic flux in different pathways.

Open Access Original Research Article

Development of a Simple and Accurate Spectrophotometric Method for the Determination of Trace Levels of Cu, Zn and Pb in Adult Egyptian Blood Samples Using (1,5-Diphenylthiocarbazone)

Farida M. S. E. El-Dars, Rasha Abd El-Razek, Samah Ali

Asian Journal of Applied Chemistry Research, Page 1-10
DOI: 10.9734/ajacr/2018/v1i39677

Aims: Development of a simple and accurate spectrophotometric method for the determination of Cu, Zn and Pb in adult Egyptians’ blood, plasma and serum using dithizone.

Place of Study:  Hematology Laboratory, Armed Forces Laboratories for Medical Research and Blood Bank, Kobry El-Kobba, Cairo, Egypt.

Methodology:  100 blood samples from adults frequenting the Hematology Lab services were randomly obtained.  The tested group comprised 57 males aging from 22 to 55 years and 43 females aging from 27 to 57 years.  Three methods: Ready-to-use Kit (Reference method), ICP-MS (validation method) and Dithizone spectrophotometric method were used to determine Cu, Zn and Pb levels in these samples.

Results: The results for the proposed dithizone revealed that the Cu levels were higher than those obtained for Zn content.  As for the per gender levels, the Cu concentration range was (60 -148.11 µg/dL) for males and for females, it was (60.71-159.19 µg/dL).  The measured Zn levels for males ranged between 72.2-132.83 µg/dL but for females, it was between 55.95 – 123.62 µg/dL.  Pb levels obtained ranged from 0 - 25.8 µg/dL and the results showed no gender distinction.  The proposed method was validated and showed a linear regression coefficient (R2) above 0.99 for all elements.  The limit of detection (LOD) for the developed method was 4.47, 4.37 and 3.97 µg/dL for Cu, Zn and Pb, respectively.  As well, the limit of quantification (LOQ) was 13.55, 13.25 and 12.03 µg/dL for Cu, Zn and Pb respectively. The modality of the data obtained was tested statistically.

Conclusion: The developed method provided wider calibration and working ranges for Cu, Zn and Pb in the tested blood samples than that reported for the reference and validation methods.  The higher levels of Cu and Zn may be linked to dietary/nutrition intake while Pb content may be more linked to anthropogenic exposure.