POLAROGRAPHIC-DETERMINATION OF URANIUM(VI) AFTER SALTING-OUT EXTRACTION AS 8-QUINOLINOLATE IN ACETONITRILE

Uranium(VI) can be extracted as its 8-quinolinolate into acetonitrile by means of salting-out with ammonium and sodium acetates, respectively; the metal oxinates extracted give a well-defined dc polarogram with E1/2=-0.80V and a sharp square wave (sw) polarogram with Ep=-0.96V in the extract. The dc wave height and the sw peak current are directly proportional to the uranium(VI) concentration in the range of 6.0×10-6 to 4.0×10-4M at pH 6.7-10.0 and 8.0×10-7 to 2.8×10-5M at pH 10.5-11.0, respectively. A number of ions do not interfere in the presence of EDTA. © 1979 Springer-Verlag.