Determination Of Trace Iron In Aqueous Samples By Its Catalytic Effect In Trinders Reaction In A Flow Injection System

A kinetic catalytic flow injection spectrophotometric method for the determination ofrntrace iron in aqueous samples has been proposed. It is based on the catalytic effect of ironrnon the oxidative coupling of 4-AP and DCPS in the presence of hydrogen peroxide and inrnslightly acidic medium to form quinine imine dye that has a maximum peak height at λmaxrnof 510 nm. The peak height observed at the flow through detector was linearlyrnproportional to iron (II, III) concentration over the range 1-20 μM.rnIn the proposed method, iron acts as a catalyst by changing its oxidation state from Fe2+rnto Fe3+ and recycle Fe3+ to Fe2+. This recycling action of iron can magnify its effect forrnthe trace analysis in aqueous samples. Thus small amount of iron can be determined byrnmeasuring the rate of the formation of the product.rnAfter optimization of flow rate, pH of the carrier solution and concentration of eachrnreagents attempt was made to utilize the developed method for the determination of ironrncontent in commercially available bottled mineral waters (Aqua Addis, Aqua safe,rnAbyssinia springs, and Highland). However, the method was not sensitive enough forrndetection of traces of iron. Different activators were tested for their enhancement ofrnsensitivity but no increment in signal was observed.

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