Complexation of Tc(IV) with SO42- in NaCl Medium

This work reports the experimental determination of the stability constant for the complexation of the Tc(IV) cation by SO 4 2 - at 1.0 mol·kg −1 ionic strength (NaCl) and p c H 1.51 ± 0.05, using a solvent extraction method. The data herein represent a first step in determining unknown thermodynami...

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Bibliographic Details
Published inJournal of solution chemistry Vol. 47; no. 7; pp. 1192 - 1201
Main Authors Parker, T. G., Omoto, T., Dickens, S. M., Wall, D. E., Wall, N. A.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.07.2018
Subjects
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Geochemistry
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Oceanography
Physical Chemistry
Radiotracers
Solvent extraction
Tc(IV)
Sulfate stability constant
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Summary:This work reports the experimental determination of the stability constant for the complexation of the Tc(IV) cation by SO 4 2 - at 1.0 mol·kg −1 ionic strength (NaCl) and p c H 1.51 ± 0.05, using a solvent extraction method. The data herein represent a first step in determining unknown thermodynamic parameters for the complexation of Tc(IV) by simple polyatomic anions. Radiotracer studies were carried out with 99 Tc and 35 S, using both HDEHP and TOPO as extractants, to characterize the mechanism of the solvent extraction and to examine the extraction of the competing species, TcO(HSO 4 ) + and TcOSO 4 , into the organic phase. The apparent stability constant log 10 β app for the complexation of Tc(IV) by sulfate was found to be 1.13 ± 0.04.
ISSN:0095-9782
1572-8927
DOI:10.1007/s10953-018-0785-1