Rapid and simultaneous determinations of copper and iron in aluminum metals and alloys

Studies on the metallurgical polarographic analysis. V

Abstract

Rapid and simultaneous determinations of copper and iron in aluminum and its alloys by polarographic method have been investigated and the following method was established. The sample is taken up in sodium hydroxide solution and sodium sulfide solution is added to separate a precipitate containing copper and iron sulfides. The precipitate is taken up in a solution of a dilute nitric acid containing bromine water and simultaneous polarographic determinations of copper and iron are carried out by the use of supporting electrolytes of 0.5 M ethylenediamine tartrate and 0.1 M pyrophosphate. Satisfactory results were obtained by using a calibration curve method and an absolute method for standard samples secured from National Bureau of Standards and factory samples.
The time required for the analysis of the two components was about 7080 min.