Binary and ternary complexation of NpO2+ with carboxylate and aminocarboxylate ligands
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Punam Thakur
and
Abraham E. Van Luik
Abstract
The complex formation of NpO2+ with carboxylates: oxalic acid (Ox), malonic acid (Mal) succinic acid (Suc); glutaric acid (Glu), methylmalonic acid (Memal), oxydiacetic acid (ODA), TDA (thiodiacetic acid) and citric acid (Cit) and aminocarboxylates: iminodiacetic acid (IDA), methyliminodiacetic acid (MIDA),nitrilotriacetic acid (NTA), 2-hydroxyethylethylenediamine triacetic acid (HEDTA),ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) was studied by solvent extraction in 6.60 m NaClO4 at 25 ℃. The formation of only the 1:1 NpO2+ complex was observed with the ligands under investigation. The complexation of NpO2+ with Ox, IDA, ODA and TDA was also measured at variable temperatures ranging from 25–60 ℃ in 6.60 m NaClO4. Results show that the complexation of NpO2+ with these ligands increases with increasing temperature. The enthalpy and entropy of complexation of NpO2+ were calculated from the temperature dependence of the stability constants using the Van't Hoff equation. Additionally, the formation of an aqueous ternary complex of the form NpO2(X)(L) (X = EDTA or HEDTA; L = Ox or ODA) was identified for NpO2+ at 25 ℃. Stabilities of these complexes are measured and discussed in term of their structures and basicities.
©2014 Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Frontmatter
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- Spectroscopic study of Np(V) oxidation to Np(VI) in 3 mol/dm3 nitric acid at elevated temperatures
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Articles in the same Issue
- Frontmatter
- Cm(III) sorption by silica: effect of alpha hydroxy isobutyric acid
- Spectroscopic study of Np(V) oxidation to Np(VI) in 3 mol/dm3 nitric acid at elevated temperatures
- Binary and ternary complexation of NpO2+ with carboxylate and aminocarboxylate ligands
- Sequestration of uranium on fabricated aluminum co-precipitated with goethite (Al-FeOOH)
- Analysis of barium borosilicate glass matrix for uranium determination by using ns-IR-LIBS in air and Ar atmosphere
- Synthesis of ordered mesoporous U3O8 by a nanocasting route
- Thermodynamic model for the solubility of BaSeO4(cr) in the aqueous Ba2+-SeO42−-Na+-H+-OH−-H2O system: Extending to high selenate concentrations
- Evaluation of a novel and efficient solvent system containing chlorinated cobalt dicarbollide for radio-cesium recovery from acidic wastes
- Modelling of niobium sorption on clay minerals in sodium and calcium perchlorate solutions
- Radioiodine labeled CdSe/CdS quantum dots: Lectin targeted dual probes
