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Title: Determination of Trace Iron in Aqueous Samples by Its Catalytic Effect in Trinder’s Reaction in a Flow Injection System
Authors: Balkew, Zewge
Advisors: Dr. Negussie Wodajo
Copyright: 2007
Date Added: 11-Dec-2007
Publisher: Addis Ababa University
Abstract: A kinetic catalytic flow injection spectrophotometric method for the determination of trace iron in aqueous samples has been proposed. It is based on the catalytic effect of iron on the oxidative coupling of 4-AP and DCPS in the presence of hydrogen peroxide and in slightly acidic medium to form quinine imine dye that has a maximum peak height at λmax of 510 nm. The peak height observed at the flow through detector was linearly proportional to iron (II, III) concentration over the range 1-20 μM. In the proposed method, iron acts as a catalyst by changing its oxidation state from Fe2+ to Fe3+ and recycle Fe3+ to Fe2+. This recycling action of iron can magnify its effect for the trace analysis in aqueous samples. Thus small amount of iron can be determined by measuring the rate of the formation of the product. After optimization of flow rate, pH of the carrier solution and concentration of each reagents attempt was made to utilize the developed method for the determination of iron content in commercially available bottled mineral waters (Aqua Addis, Aqua safe, Abyssinia springs, and Highland). However, the method was not sensitive enough for detection of traces of iron. Different activators were tested for their enhancement of sensitivity but no increment in signal was observed.
Description: Graduate Project Chem. 774 Submitted to the School of Graduate Studies Addis Ababa University In Partial Fulfillment of the Requirement of the Degree of Master of Science in Chemistry
URI: http://hdl.handle.net/123456789/341
Appears in:Thesis - Chemistry

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