Polymerization of Uranyl-Citrate, -Malate, -Tartrate and -Lactate Complexes<sup>1</sup>

Feldman, Isaac; Havill, Jean R.; Neuman, W. F.

doi:10.1021/ja01647a070

Cited by 45 publications

(33 citation statements)

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“…First of all, our check was the determination of the stability constants of the (UO 2 ) 2 (Cit) 2 2− , which is the most stable uranyl/citrate species [8,9,11,14,15,19,28,36] and that reaches, also at low component concentrations (C UO 2 2+ > 1 mmol L −1 ), high formation percentage (more than 80%). Since measurement were carried out up to the basic pH range, we checked and observed the formation, of two binuclear hydrolytic species, namely (UO 2 ) 2 (Cit) 2 (OH) 2 4− and (UO 2 ) 2 (Cit) 2 (OH) 3− , formed at pH ≥ 4.5 with high formation percentage.…”

Section: Speciation Model For the Dioxouranium(vi) -Citrate Systemmentioning

confidence: 99%

Potentiometric and spectrophotometric characterization of the UO₂ ²⁺-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

Berto

Crea

Daniele

et al. 2011

Ract

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Dioxouranium(VI)-citrate / Speciation / Sequestering ability / Dependence on ionic strength / SIT equationSummary. In this paper we report an investigation on the interactions between dioxouranium(VI) and citrate using potentiometry (H + -glass electrode) and UV-spectrophotometry. Potentiometric measurements were carried out in NaCl and KNO 3 aqueous solutions at t = 25 • C in a wide range of experimental conditions (concentrations, ligand/metal molar ratio, pH, titrants). Measurements in NaCl were carried out at different ionic strength values (0.1 ≤ I/mol L −1 ≤ 1.0); different procedures were employed for the acquisition of experimental data and careful analysis of these data performed. In all cases the speciation model that best fits experimental data takes into account the formation of the following species: UO 2 (Cit) − , (UO 2 ) 2 (Cit) 2 2− , (UO 2 ) 2 (Cit) 2 (OH) 2 4− , (UO 2 ) 2 (Cit) 2 (OH) 3− , (UO 2 ) 2 (Cit)(OH) 2 − , (UO 2 ) 2 (Cit)(OH) 0 , (UO 2 ) 3 (Cit) 2 (OH) 5 5− . The dependence on ionic strength of formation constants was taken into account by using both a simple Debye-Hückel type equation and the SIT (specific ion interaction theory) approach.Moreover, a visible absorption spectrum for each complex reaching a significant percentage of formation in solution (KNO 3 medium) has been calculated to characterise the compounds found by pH-metric refinement.Recommended values for the uranyl-citrate species were proposed for each ionic strength value in NaCl aqueous solution. Comparison with literature stability constants is reported too.

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Section: Speciation Model For the Dioxouranium(vi) -Citrate Systemmentioning

confidence: 99%

Potentiometric and spectrophotometric characterization of the UO₂ ²⁺-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

Berto

Crea

Daniele

et al. 2011

Ract

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“…Numerous uranyl-citrate complexes have been proposed in the literature: a 1:1 uranyl-citrate complex (Newman et al, 1951;Rajan and Martell, 1965;Markovits et al, 1972;Nunes and Gil, 1987;Lenhart et al, 2000), a 2:1 complex (Nunes and Gil, 1987), a 2:2 complex (Newman et al, 1951;Feldman et al, 1954;Rajan and Martell, 1965;Markovits et al, 1972;Nunes and Gil, 1987;Allen et al, 1996), a 2:3 complex (Dodge and Francis, 1997), a 3:2 complex (Feldman et al, 1954) and a hexameric complex (Rajan and Martell, 1965). In our speciation calculations, we consider only the complexes for which a formation constant exists: the mononuclear (1:1) and binuclear (2:2) complexes.…”

Section: Fate Of Uranylmentioning

confidence: 99%

Association of uranyl with the cell wall of Pseudomonas fluorescens inhibits metabolism

Bencheikh-Latmani

Leckie

2003

Geochimica et Cosmochimica Acta

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Abstract-Citric acid is found along with uranyl in the subsurface of former nuclear facilities because of its use as a decontamination agent in the nuclear industry. Citrate's metal chelating properties affect the mobility of uranyl in the subsurface and consequently, citrate biodegradation may significantly impact uranyl fate and transport. Under the non-growth conditions considered, low (micromolar) uranyl concentrations inhibit the biodegradation of citrate by Pseudomonas fluorescens, a common subsurface denitrifying bacterium. Additionally, uranyl is found readily associated with the cell envelope of P. fluorescens. The observed inhibition appears to be linked to the binding of uranyl to the cell surface and is reversible by desorbing cell-bound uranyl. This study establishes a link between uranyl association with the cell surface and the observed inhibitory effect of uranyl on cell metabolism.

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“…From the values of the vicinal coupling constants we see that in all complexes the ligand conformation is such that an approximately trans and a gauche arrangement of H atoms is present. This excludes conformation c, proposed by Feldman et al (1,2,11).…”

Section: Coh Hmentioning

confidence: 69%

“…the ligand being in a conformation close to c, The interaction of uranyl ion with malic acid has been previously studied by potentiometric (1)(2)(3)(4), polarographic (4,5), spectrophotometric (1,4,6,7), and polarimetric (8) methods. It has been found that, in equimolar solutions and for the pH region ;;,* H 2-4, a binuclear complex involving tridentate chelation is formed (as has also been shown for the…”

Section: Introductionmentioning

confidence: 99%

¹H and ¹³C nuclear magnetic resonance study of the complexation of uranyl ion with malic acid

Nunes¹,

Gil²,

Xavier³

1982

Can. J. Chem.

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M. TERESA NUNES, VICTOR M. S. GIL, and ANTONIO V. XAVIER. Can. J. Chem. 60, 1007 (1982). A full pH range IH and I3C nrnr study was performed of the complexation of UOZz+ with malic acid, for variable concentrations and molar ratios. Spectral evidence for the existence of at least five complexes was found, and their stoichiometry and dependence on pH were investigated. Information on the conformation of the bound ligand molecules was also obtained.

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Polymerization of Uranyl-Citrate, -Malate, -Tartrate and -Lactate Complexes¹

Cited by 45 publications

References 0 publications

Potentiometric and spectrophotometric characterization of the UO₂ ²⁺-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

Potentiometric and spectrophotometric characterization of the UO₂ ²⁺-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

Association of uranyl with the cell wall of Pseudomonas fluorescens inhibits metabolism

¹H and ¹³C nuclear magnetic resonance study of the complexation of uranyl ion with malic acid

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Polymerization of Uranyl-Citrate, -Malate, -Tartrate and -Lactate Complexes1

Cited by 45 publications

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Potentiometric and spectrophotometric characterization of the UO2 2+-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

Potentiometric and spectrophotometric characterization of the UO2 2+-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

Association of uranyl with the cell wall of Pseudomonas fluorescens inhibits metabolism

1H and 13C nuclear magnetic resonance study of the complexation of uranyl ion with malic acid

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Polymerization of Uranyl-Citrate, -Malate, -Tartrate and -Lactate Complexes¹

Potentiometric and spectrophotometric characterization of the UO₂ ²⁺-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

Potentiometric and spectrophotometric characterization of the UO₂ ²⁺-citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes

¹H and ¹³C nuclear magnetic resonance study of the complexation of uranyl ion with malic acid