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In the previous report the authors reported the rapid determination method of Fe in the pure Al foil or Al-Fe mother alloy by using sulphuric acid as a dissolving agent.In this method, the Fe in sample can be dissolved with sulphuric acid as Fe2+ state without using any reducing reagent, the reduced metallic Cu is filtered off, and the filtrate is titrated with standard potassium permanganate solution.Interference of Ti or V in the determination of Fe in Al-alloy was reported by G. H. Osborn and W. Stross, whose method was as follows:The sample was dissolved in sodium hydro-oxide solution, which was then acidified with dilute sulphuric acid. Reducing Fe3+ to Fe2+ with nickel powder the Fe was titrated with patassium permanganate. The details of the method, however, were not reported.The present authors studied the interference of the presence of Ti, V, Cu, Cr and Sn in pure Al foil or Al-Fe mother alloy and the following results were obtained:1. Fe in the pure Al foil.The coexistence in small amount of less than 0.05%V, less than 0.6%Cr, and less than 0.05%Sn does not interefere, but the presence of large amounts of these elements gives positive errors.The coexistence of less than 0.1%Ti gives no error, but approximatly 0.1-0.4%Ti gives negative errors, and the presence of Ti up to 1% positive errors.2. Fe in the Al-Fe mother alloy.The coexistence in small amount of less than 0.1%V and less than 0.6%Sn gives no error, but the presence of large amounts of these elements positive errors.The presence of approximathy 0.4%Ti gives negative errors and up to 3.2%Ti gives positive errors.The presence of Cu and Cr does not interfer with the determination of the Fe.

Rapid determination of Fe in pure Al foil and Al-Fe mother alloy by decomposition with sulfuric acid