Published 1985 | Version v1
Journal article Metadata-only

Studies on neptunium(V) carbonate complexes under geologic repository conditions

Creators

  • 1. Commission of the European Communities, Ispra (Italy). Nuclear Chemistry Div.

Description

The complexation of Np(V) by carbonate was studied at 0.2 M ionic strength using a solvent extraction technique with a synergic mixture of TOMA-TTA in benzene. In the investigated range of carbonate alkalinity (from 0 to 10-2 M) and pH (8-9) the species NpO2OH, NpO2CO3- and NpO2(CO3)23- were identified and their stability constants (β) were calculated. The values of log β were 4.16, 4.13 and 7.06, respectively. From these data it appears that complexing by carbonate is one of the major factors affecting the speciation of Np(V) in natural waters. (orig.)

Additional details

Publishing Information

Journal Title
Radiochim. Acta
Journal Volume
38
Journal Issue
1
Series
Radiochim. Acta.
Journal Page Range
21-26
ISSN
0033-8230
CODEN
RAACA

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
17013647
Subject category
S12: MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES;
Descriptors DEI
AQUEOUS SOLUTIONS; GEOLOGIC FORMATIONS; NEPTUNIUM CARBONATES; NEPTUNIUM COMPLEXES; NEPTUNIUM 237; NEPTUNIUM 239; ORGANIC COMPOUNDS; PH VALUE; RADIOACTIVE WASTE STORAGE; SOLVENT EXTRACTION; STABILITY; TRACER TECHNIQUES; VALENCE
Descriptors DEC
ACTINIDE COMPLEXES; ACTINIDE COMPOUNDS; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON COMPOUNDS; CARBONATES; COMPLEXES; DAYS LIVING RADIOISOTOPES; DISPERSIONS; HEAVY NUCLEI; HOMOGENEOUS MIXTURES; ISOTOPE APPLICATIONS; ISOTOPES; MANAGEMENT; MIXTURES; NEPTUNIUM COMPOUNDS; NEPTUNIUM ISOTOPES; NUCLEI; ODD-EVEN NUCLEI; OXYGEN COMPOUNDS; RADIOISOTOPES; SEPARATION PROCESSES; SOLUTIONS; STORAGE; TRANSURANIUM COMPLEXES; TRANSURANIUM COMPOUNDS; WASTE MANAGEMENT; WASTE STORAGE; YEARS LIVING RADIOISOTOPES