Abstract
Electrolytic deposition of various metal ions from a solution containing 0.4 M sodium tartrate and 0.1 M sodium acid tartrate by the use of a platinum electrode has been investigated. The deposition potentials of these metals for cathodic deposition against saturated calomel electrode were estimated with the following result : Au + 0.50 V, Ag + 0.30 V, Hg + 0.25 V, Cu-0.30 V, Bi-0.35 V, Pb-0.50 V, Cd-0.90 V, Sb-0.75 V and Zn-1.10 V (vs. S. C. E. ). Also, electrolytic determinations of these metals were made with the use of a controlled cathode potential method, and it was found that these metals give quantitative electrodeposition, except for Au, Ag, and Hg. Similarly, electrolytic separation and quantitative determination of Cu-Bi, Cu-Cd, Bi-Cd, Cu-Pb, Pb-Cd, Cu-Zn, and Cu-Bi-Cd-Zn were carried out with good results.
Fundamental studies on the electrolysis of various metal ions in ammoniac solution have been made. The deposition potentials of these metal ions in a solution containing 1.2 N NH4OH and 0.2 M NH4Cl were estimated with the following results : Ag-0.05 V, Hg-0.05 V, Cu-0.45 V, Co-0.85 V, Ni-0.90 V, Cd-0.90 V, and Zn-1.40 V (vs. S. C. E. ). After confirmation of quantitative electrodeposition of these metals by controlled cathode potential electroanalysis, separation and quantitative determination of Ag-Cu, Cd-Zn, Cu-Ni, Ag-Cd, etc. were made with good results.
