Polarographic Studies of Uranium in α‐Hydroxy‐Iso‐Butyrate Medium

Uranyl perchlorate in aqueous solution containing α‐hydroxy‐ iso ‐butyric acid (HA) and sodium perchlorate was observed at varying pH's. Two reduction waves with half‐wave potentials at −0.22 and −0.95 volts vs. S. C. E ., observed at p H below 3.0, are attributable to the polarographic reductions, UO 2 e→UO 2 + and UO e→UO + , or UOOH + +e→UOOH, while the first wave observed above pH 3.0 or in large excess of HA above pH 2.0, may be attributable to the reduction of UO 2 A + complex and the third wave at −1.2 volt vs. S. C. E . to that of UOA + complex or its dimer. A confirmation for the latter was made by polarographic reduction of uranous sulfate in HA and NaClO 4 solution.