Determination of plutonium by two-step flow-coulometry at the column electrode.
A two-step flow-coulometry method has been developed for rapid determination of elements (plutonium, iron, etc) which exist in various oxidation states in solution, and applied to the determination of plutonium in 0.5M sulphuric acid medium. The first-step column electrode potential is fixed at between +0.10 and +0.35 V vs. Ag-AgCl, and all plutonium ions are reduced to Pu(III). The second-step column electrode potential is fixed at +0.75 V vs. Ag-AgCl, and Pu(III) which flows from the first column electrode is oxidized to Pu(IV). The quantity of plutonium is determined from the number of coulombs used in the oxidation. It is possible to eliminate interference by diverse ions by electroanalysis at the first column electrode. About a 10-mul sample is necessary and the electrolysis for determination is finished in 1 min.
Kihara
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S
Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken, Japan.
Yamamoto
T
T
Motojima
K
K
Fujinaga
T
T