Rapid and simultaneous determinations of cadmium, nickel, and zinc in copper-base alloys

Studies on metallurgical polarographic analysis. VII.

Abstract

A rapid and simultaneous method for the determinations of cadmium, nickel, and zinc in brass and bronze by polarography has been investigated and the following method has been established. The sample (0.2 g) is dissolved in aqua regia, the solution is made weakly acidic (perchloric acid), 1 ml of a saturated solution of sodium sulfite and 10 ml of 1N sodium thiocyanate are added, and the solution is diluted to 50 ml. The free copper is separated as a precipitate of CuSCN by boiling. A part of the filtrate is treated with 1N ammonia and 1N ammonium chloride solutions, and the three components of nickel, cadmium, and zinc are simultaneously determined by polarography. Six kinds of samples were analyzed by this method, and good agreement was obtained with the results obtained by chemical analyses. The time required for analysis of the three components was 3540 min.