INTERACTION OF NEPTUNYL(V) AND URANYL(VI) WITH EDTA IN NACL MEDIA - EXPERIMENTAL-STUDY AND PITZER MODELING

Authors
POKROVSKY OS BRONIKOWSKI MG MOORE RC CHOPPIN GR
Citation
Os. Pokrovsky et al., INTERACTION OF NEPTUNYL(V) AND URANYL(VI) WITH EDTA IN NACL MEDIA - EXPERIMENTAL-STUDY AND PITZER MODELING, Radiochimica Acta, 80(1), 1998, pp. 23-29
Citations number
30
Categorie Soggetti
Nuclear Sciences & Tecnology","Chemistry Inorganic & Nuclear
Journal title
Radiochimica Acta → ACNP
ISSN journal
00338230
Volume
80
Issue
1
Year of publication
1998
Pages
23 - 29
Database
ISI
SICI code
0033-8230(1998)80:1<23:IONAUW>2.0.ZU;2-V
Abstract
The complexation of Np(V) and U(VI) by EDTA has been investigated in s olutions of 0.3 to 5 m NaCl with pH 2 to 9 at 25 degrees C. A solvent extraction method with HDEHP in heptane was used to measure the stabil ity constants of the species NpO2H2Y-, NpO2HY2-, NpO2Y3-, UO2HY-, and UO2Y2-. The constants showed a small dependence on ionic strength betw een 1 and 5 m NaCl. The data were modeled using the ion-interaction mo del of Fitter. Binary interaction parameters are reported for each ion pair necessary to fully represent EDTA deprotonation, and complexatio n of neptunyl and uranyl with EDTA in 0 to 5 m NaCl solutions.