Skip to main content
Article
Licensed
Unlicensed Requires Authentication

Ternary uranium(VI) carbonato humate complex studied by cryo-TRLFS

  • , , , and
Published/Copyright: June 8, 2011
Radiochimica Acta
From the journal Radiochimica Acta Volume 99 Issue 11

Abstract

The complex formation of U(VI) with humic acid (HA) in the presence of carbonate was studied by time-resolved laser-induced fluorescence spectroscopy at low temperature (cryo-TRLFS) at pH 8.5. In the presence of HA, a decrease of the luminescence intensity of U(VI) and no shift of the emission band maxima in comparison to the luminescence spectrum of the UO2(CO3)34− complex, the dominating U(VI) species under the applied experimental conditions in the absence of HA, was observed. The formation of a ternary U(VI) carbonato humate complex of the type UO2(CO3)2HA(II)4− starting from UO2(CO3)34− was concluded from the luminescence data. For this complex a complex stability constant of log K=2.83 ± 0.17 was determined. Slope analysis resulted in a slope of 1.12 ± 0.11, which verifies the postulated complexation reaction. The results agree very well with literature data. Speciation calculations show that the formation of the ternary U(VI) carbonato humate complex can significantly influence the U(VI) speciation under environmental conditions.

Keywords: Uranium(VI); Humic acid; Carbonate; Complexation; Ternary complex
* Correspondence address: Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiochemistry, P. O. Box 510 119, 01314 Dresden, Deutschland,
Published Online: 2011-06-08
Published in Print: 2011-11

© by Oldenbourg Wissenschaftsverlag, Dresden, Germany

Articles in the same Issue

  1. Tricarbonate complex of hexavalent Am with guanidinium: synthesis and structural characterization of [C(NH2)3]4[AmO2(CO3)3]·2H2O, comparison with [C(NH2)3]4[AnO2(CO3)3] (An=U, Np, Pu)
  2. Ternary uranium(VI) carbonato humate complex studied by cryo-TRLFS
  3. Influence of contact time on the extraction of 233uranyl spike and contaminant uranium from Hanford Site sediment
  4. Thermodynamics of complexation of lanthanides with 2,6-bis(5,6-diethyl-1,2,4-triazin-3-yl) pyridine
  5. Extraction of caesium(I) from HNO3 medium using room temperature ionic liquid containing calix[4]crown ligands as the selective extractants
  6. Bioaccumulation of polonium (210Po) and uranium (234U, 238U) in plants around phosphogypsum waste heap in Wiślinka (northern Poland)
  7. Development of a micro electrochemical cell for in-situ deposition of 63Ni for use in electron capture detector (ECD) in gas chromatography
  8. In vivo212Pb/212Bi generator using indium-DTPA-tagged liposomes
  9. Determination of trace impurities of chlorine in zirconium-alloy matrices using neutron activation technique
https://doi.org/10.1524/ract.2011.1861
Keywords for this article
Uranium(VI); Humic acid; Carbonate; Complexation; Ternary complex

Articles in the same Issue

  1. Tricarbonate complex of hexavalent Am with guanidinium: synthesis and structural characterization of [C(NH2)3]4[AmO2(CO3)3]·2H2O, comparison with [C(NH2)3]4[AnO2(CO3)3] (An=U, Np, Pu)
  2. Ternary uranium(VI) carbonato humate complex studied by cryo-TRLFS
  3. Influence of contact time on the extraction of 233uranyl spike and contaminant uranium from Hanford Site sediment
  4. Thermodynamics of complexation of lanthanides with 2,6-bis(5,6-diethyl-1,2,4-triazin-3-yl) pyridine
  5. Extraction of caesium(I) from HNO3 medium using room temperature ionic liquid containing calix[4]crown ligands as the selective extractants
  6. Bioaccumulation of polonium (210Po) and uranium (234U, 238U) in plants around phosphogypsum waste heap in Wiślinka (northern Poland)
  7. Development of a micro electrochemical cell for in-situ deposition of 63Ni for use in electron capture detector (ECD) in gas chromatography
  8. In vivo212Pb/212Bi generator using indium-DTPA-tagged liposomes
  9. Determination of trace impurities of chlorine in zirconium-alloy matrices using neutron activation technique
Downloaded on 25.4.2026 from https://www.degruyterbrill.com/document/doi/10.1524/ract.2011.1861/html?lang=en
Scroll to top button