Abstract
PREVIOUSLY described experiments1 have shown that under certain conditions of electrolysis of sulphuric or hydrofluoric solutions of protactinium, this element can be deposited on the cathode, at least in extremely thin layers. I have now observed, in sulphuric solutions, an anodic deposit on a lead oxide (PbO2) support. Normal solutions of sulphuric acid containing about 10-5 gm. of protactinium in presence of 1 or 2 mgm. of zirconium sulphate were used. With a cathode of platinum, an anode of platinum covered with lead oxide (PbO2) and a current of 5–20 mA./cm.2, the yield is 30–60 per cent after two or three hours, with moderate stirring. Under these conditions the deposit on the cathode is insignificant. An anodic deposit can also be observed on gold anodes, but these electrodes are severely attacked. I have never observed an anodic deposit on pure platinum electrodes. The yield is reduced if sulphuric acid is replaced by nitric acid.
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