KINETICS OF PU(IV) OXIDATION WITH PERSULFATE IN ALKALI SOLUTIONS

Authors
YUSOV AB GARNOV AY SHILOV VP KROT NN
Citation
Ab. Yusov et al., KINETICS OF PU(IV) OXIDATION WITH PERSULFATE IN ALKALI SOLUTIONS, Radiochemistry, 39(6), 1997, pp. 521-524
Citations number
6
Journal title
Radiochemistry → ACNP
ISSN journal
10663622
Volume
39
Issue
6
Year of publication
1997
Pages
521 - 524
Database
ISI
SICI code
1066-3622(1997)39:6<521:KOPOWP>2.0.ZU;2-Y
Abstract
A 6.8 x 10(-3) M suspension of freshly precipitated Pu(IV) hydroxide i n 0.5-8 M NaOH is oxidized with 0.01-0.05 M S2O82- at 23-62 degrees C to give Pu(VI); in 4-8 M NaOH Pu(VII) also appears. Dissolution of plu tonium accelerates with temperature and with increasing NaOH and S2O82 - concentrations. The reaction mechanism is discussed; its key stages are reaction of S2O82- with Pu(IV) and Pu(V) in the solid phase, dispr oportionation of Pu(V) in 0.5-4 M NaOH, and reaction of Pu(VI) with S2 O82- in 4-8 M NaOH.