In this paper, the simple, accurate and rapid method for the determination of Cu in Sn-base alloys, is explained.
Cu is determined from HNO3-HF medium by the internal electrolysis, using a lequid Pb-Hg as an anode.
In this experiment, Sb+5,As+5,Sn+4 and Zn+2 do not interfere. Sb and As should be oxidized prior to the electrolysis. Sn is changed into the state of Sn+4 when the sample is dissolved in a Pt-dish by the procedure given. If the sample contains Bi,it is deposited with Cu. In such a case,Bi is removed from the solution, obtained by dissolving the combined deposits with HNO3 and Cu is replated from the filtrate as in the preceding procedure. Ag is also plated with Cu. After dissolving the combined deposits, the determination can be completed by determining Ag by the re-deposition from the solution, acidified by H2SO4, and getting Cu by difference.
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