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Oscillographic polarography in quantitative analysis. XVIII. Analysis of alloys

R. Jezdinsky

CSAV, Prague.

 

Abstract: In a-c. oscillographic polarography with a Hg dropping electrode, a new method was proposed for rapid quant. analysis of metal alloys. First, the depths of the anodic incisions on the curve dE/dt = f(E) of the sample soln. in a supporting electrolyte (soln. A) were measured. Then the soln. A was substituted by a soln. B contg. a known fraction of the sample concn. of soln. A. and this more dild. soln. was titrated alternatively by standard solns. so that the original depths of anodic incisions were reached. Thus, Cu and Zn was detd. in an alloy contg. Zn 3.1, Cu 0.2, Mn 0.38, Al 6, Si 0.05, and Mg 90.27%; Cu, Ni, and Zn was detd. in alloys contg. Al 0.2-10, Cu 52.2-84.6, Fe 0.09-2, Mn 0-2.2, Ni 0.06-4.2, Pb 0-2.1, Sn 0.02-1, and Zn 0.03-40.7%. To prep. a sample soln. (I) dissolve 0.1-0.5 g. of the alloy in 5-10 ml. of HNO3 and dil. to 50-100 ml. with H2O. To det. Cu in Mg alloy: soln. A 3 ml. of I + 5 ml. of M NaNO3, soln. B 2 ml. of I + 6 ml. M NaNO3. For Cu concns. of 10-6 g./ml.: soln. A 1.5 ml. of I + 5.5 ml. of M NaNO3 + 0.5 ml. of 0.1M NH4CNS, soln. B 1 ml. of I + 6 ml. of M NaNO3 + 0.5 ml. of 0.1M NH4CNS. To det. Cu and Zn in brass: soln. A 1.5 ml. of I + 4.5 ml. of M NaNO3 + 4 ml. of 0.5M NH3-NH4Cl buffer, soln. B 1 ml. of I + 5 ml. of M NaNO3 + 4 ml. of 0.5M NH3-NH4Cl buffer. To det. Ni in brass: soln. A: 1.5 ml. of I + 1 ml. of 0.05M Tiron + 7.5 ml. of M KCN, soln. B 1 ml. of I + 1 ml. 0.05M Tiron + 8 ml. of M KCN.

Full paper in Portable Document Format: 164-5a295.pdf (in German)

 

Chemical Papers 16 (4-5) 295–301 (1962)

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