A method was developed for the determination of 25 to 200 mg. of cobalt in plutonium-cerium-cobalt alloys. The cobalt is electro-deposited from basic ammonium sulfate solution containing sulfite ion at a controlled potential of -1. 00 to -1. 05 volts vs. a saturated calomel electrode and at a temperature in the range of 70 to 90° C. The plutonium and cerium are complexed and held in solution by citrate ion. Recoveries of 27-, 54-, 109-, and 221-mg. quantities of cobalt were 99.3, 99.7, 99.9, and 100.0% with relative standard deviations of 0.57, 0.30, 0.13, and 0.12%, respectively. Of 35 added ions, 17 did not cause a deviation in the cobalt recovery greater than 0. 5%.
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