CJ-VOLUME 04 ISSUE 02 SEPTEMBER 2014


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Volume 4 Issue 2, September 2014

Chemistry Journal

ISSN

2049-954X

Publication Frequency

6 Issues per year

Pages

13-36

Publication History


Original Articles

Chemical Composition of the Seeds and the Defatted Meal of Garcinia kola Heckel (Guttifferae) from Benin

P. Yété, V. Ndayishimiye, P.C. Agbangnan, S.T. Djènontin, V.D. Wotto and D.C.K. Sohounhloué

Pages 13-19


Extractive Spectrophotometric Determination of Nickel with 2-hydroxy-5-iodothiophenol and Diphenylguanidine

Ali Z. Zalov and Kiril B. Gavazov

Pages 19-25

The Phase Equilibria in the Cu8GeS6-Cu8GeSe6 System and Thermodynamic Properties of Solid Solutions

Sara Mohammad Bagheri, Isfandiyar Jalal Alverdiyev, Samira Zakir Imamaliyeva and Mahammad Baba Babanly

Pages 26-31

Wet Process Phosphoric Acid Treatment by Hydrogen Peroxide

Khleifia Naima, Hamdi Rania, Abbes Noureddine and Hannachi Ahmed

Pages 32-



Title

Chemical Composition of the Seeds and the Defatted Meal of Garcinia kola Heckel (Guttifferae) from Benin

Abstract

Garcinia kola is a medium sized tree found in the moist forests and widely distributed throughout West and Central Africa. The edible nut is highly valued in these countries. Seeds, commonly known as the bitter kola are appreciated. The seeds are used in traditional medicine and in many herbal preparations for the treatment of diseases such as laryngitis, liver disorders and bronchitis. The objective of this work is to determine the chemical composition of the seeds and defatted meal of Garcinia kola from Benin. The results of proximate analysis have showed that the seeds and defatted meal of Garcinia kola Heckel contained several families of chemical compounds: flavonoids, tannins, alkaloids, anthraquinons, saponosids, leuco-anthocyanins, anthocyanins and heterosids. The contents of total phenols (1.65±0.08 mg/g), flavonoids (0.35±0.30 mg/g), anthocyanins (0.80±0.15 mg/g) in the seeds are present in significant amounts. Garcinia kola can be used as anti-inflammatory and as active components of drugs derived from plants. The average percentages in starch, total sugars, and crude protein are: 62.9±0.4; 12.0±0.2; 3.69±0.50 % respectively. The mineral elements: N (0.59± 0.10%), P (0.09 ±0.00%), K (0.34±0.00%), Mg (0.07±00%), Ca (0.10±0.00%) show that Garcinia kola may be a good source of minerals. These results suggest that Garcinia kola possesses nutritional and healthy benefits.

Keywords

Traditional Medicine, Chemical Compounds, Garcinia kola Heckel, Nutrients


Title

Extractive Spectrophotometric Determination of Nickel with 2-hydroxy-5-iodothiophenol and Diphenylguanidine

Abstract

Nickel(II) forms well chloroform-extractable ternary complex with 2-hydroxyl-5-iodothiophenol (HITP) and diphenylguan-idine (DPG). The complex, which has a composition of 1:2:2 (Ni:HITP:DPG) and a two-phase stability constant of Log b = 6.62, could be used for selective, sensitive, and reliable extractive spectrophotometric determination of nickel. The wavelength of maximum absorption, molar absorptivity, Sandell’s sensitivity, optimum pH interval, limit of detection, range of linearity, and relative standard deviation of the developed procedure were 480 nm, 2.64´104 L mol-1 cm-1, 2.23 ng cm-2, 4.5-6.8, 0.02 mg mL-1, 0.07-3.6 mg mL-1 and £1.8%, respectively. It was applied for nickel determination in metallic magnesium and a geological sample-carnallite.

Keywords

Nickel(II), 2-Hydroxy-5-Iodothiophenol, Ternary Complex, Liquid-Liquid Extraction


Title

The Phase Equilibria in the Cu8GeS6-Cu8GeSe6 System and Thermodynamic Properties of Solid Solutions

Abstract

Phase equilibria in the Cu8GeS6-Cu8GeSe6 system were studied by using DTA and XRD (X-ray Powder Diffraction) methods as well as Electromotive Force (EMF) measurements with the Cu4RbI5 solid electrolyte. The T-x phase diagram and corresponding “composition-property” diagrams were constructed. It was shown that the system is characterized by continuous series of solid solutions between HT-modifications of starting compounds. Formation of solid solutions decreases the temperature of polymorphic transitions of both compounds.

Keywords

Cu-Ge Chalcogenides, Solid Solutions, Polymorphic Transformation, EMF Method, Thermodynamic Functions


Title

Wet Process Phosphoric Acid Treatment by Hydrogen Peroxide

Abstract

This work reports an experimental study on the increase of Electromotive Force (EMF) of Wet Process Phosphoric Acid (WPA) using hydrogen peroxide (H2O2) 30% wt. as oxidizing agent. This operation allows oxidizing many chemical species of WPA and is used as a preachment to metal extraction from the acid. The EMF was used as an indicator for the oxidation degree of chemical species contained in the acid. To ensure that relevant chemical species were at their highest valences, the oxidant was added until the uppermost EMF value was reached. The effects of WPA concentration and temperature were examined. The experimental results led to the determination of the best operating conditions of uranium oxidation in WPA produced from processing the Tunisian phosphate. For the WPA concentration range 25-35% wt. P2O5, the required H2O2 amount is independent of the acid concentration. The temperature increase reduces the contact time and the oxidizing agent specific consumption. 

Keywords

Oxidation, Treatment, Hydrogen Peroxide, Phosphoric Acid, Electromotive Force