Abstract
The author proposes a method of polarographic analysis for determining the impurities, iron, copper, bismuth, cadmium, zinc, tin, and antimony, in refined lead. The determinations of Fe, Cu, Bi, Cd, and Zn are carried out simultaneously in nitric acid solution, buffered to PH 3.7 with sodium bitartrate, after precipitation of the lead as sulphate. The determination of the antimony is done, starting with a solution in concentrated sulphuric acid, then eliminating the excess acid and making alkaline, in the presence of sodium tartrate. The tin is determined on the same sulphuric acid solution, after addition of sodium hypophosphit in hydrochloric acid solution, and subsequently making alkaline in the presence of sodium tartrate.
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