Print ISSN: 1812-125X

Online ISSN: 2664-2530

Keywords : Oxidation


Air Blowing Oxidation Process for Improving of Rheological Properties of Sulfur Treated Asphalt

Wijdan Mohammed Saleh

JOURNAL OF EDUCATION AND SCIENCE, 2020, Volume 29, Issue 1, Pages 15-21
DOI: 10.33899/edusj.2020.164360

There is a growing need for the production of a certain types of asphaltic materials having a good rheological properties compared with the non-modified a asphaltic materials can be using as a paving materials.
In this research Rheological properties of Beije asphalt modified using oxidation process in the present of Sulphur and chlorides of (iron and zink).
In this research we obtained asphaltic materials which can be used in paving and mastic according to the measuring of the (ductility, penetration and softening point.

Indirect Spectrophotometric Determination of Niclosamide in Pharmaceutical Preparations

Nabeel S. Othman; Saad H. Sultan

JOURNAL OF EDUCATION AND SCIENCE, 2018, Volume 27, Issue 3, Pages 1-18
DOI: 10.33899/edusj.2018.159307

A simple and sensitive indirect spectrophotometric method is developed for the determination of niclosamide in pharmaceutical preparations. The method is based on the oxidation of reduced form of niclosamide with iron ( III ) in acidic medium, then the subsequent reaction of iron ( II ) with 1,10- phenanthroline to produce a ferroin complex which is water - soluble , stable (using EDTA solution improve the stability of the complex) , and has a maximum absorption at 510 nm against the reagent blank with a molar absorptivity of 2.19×104 l.mol-1.cm-1 . Beer,s law is valid over the concentration range of 2.5 to 225 μg/10 ml. The relative error is in between - 1.80 and +1.50 % and the relative standard deviation from ± 0.89 to ± 2.07 % depending on the concentration of niclosamide . The proposed method has been applied successfully to determine niclosamide in pharmaceutical preparations.

Study of the kinetics and mechanism of oxidation of some esters by potassium permanganate in acid medium

Ibrahim Younis Mohammad

JOURNAL OF EDUCATION AND SCIENCE, 2013, Volume 26, Issue 2, Pages 47-58
DOI: 10.33899/edusj.2013.89766

Abstract:
In this study, the kinetics and mechanism of oxidation of some esters (ethyl ,butyl and methyl benzoate) by potassium permanganate in acid medium were established and this study showed that reaction rate law is depended to permanganate ion concentration only at high concentration of ester according to following equation:

r = k [KMnO4]

(k) rate constant of pseudo first order reaction where: k=k2[ester]

The value of k is calculated from Aplot of (ln a/a-x) againet the time.
Arrhenis plot (lnk) against (1/Tk°) allowed us to determine the value of (Ea,A,ΔH#,ΔG#,ΔS#). Addition the [H2SO4] increase the rate constant increase. this results are in accordance with the mechanism proposed of oxidation reaction.

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