Abstract
A new method for the photometric determination of 0.020.7% uranium in iron and steel with Arsenazo III has been studied. Uranium is determined after reduced to the four valence stage by the liquid zinc amalgam reduction method. The established procedure is as follows.
Two tenth g. sample is decomposed with hydrochloric acid and hydrogen peroxide. One tenth aliquot is taken and reduced in 6N hydrochloric acid for two min. by the liquid zinc amalgam. Five ml of 0.1% Arsenazo III is added to form a blue complex, and the solution is diluted to 100 ml with 6N hydrochloric acid. Uranium is determined from the absorbance at 666 mμ.
The determination was carried out in the presence of iron within an absolute error of 0.01%. The time required for an analysis was about 40 min. Elements commonly present in iron and steel except zirconium scarcely interfered.
