Mixed complexes of alkaline earth uranyl carbonates: A laser-induced time-resolved fluorescence spectroscopic study

Geipel, Gerhard; Amayri, Samer; Bernhard, Gert

doi:10.1016/j.saa.2007.11.007

Cited by 64 publications

(71 citation statements)

References 17 publications

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“…Formation data for these ternary species have been determined in the last decade Brooks, 2006, 2008;Geipel et al, 2008;Lee and Yun, 2013), but few compiled thermodynamic databases have included them (e.g., they have been recently added to Thermochimie, www.thermochimie-tdb.com). In this study, equilibrium speciation calculations of effluent column solutions, which included all recently reported uranyl carbonate species (Table S3 , comprising over 99% of dissolved uranyl in the high carbonate BPW solutions (Fig.…”

Section: àmentioning

confidence: 99%

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Reinoso-Maset

Steefel

et al. 2017

Geochimica et Cosmochimica Acta

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Section: àmentioning

confidence: 99%

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Reinoso-Maset

Steefel

et al. 2017

Geochimica et Cosmochimica Acta

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“…Brooks (2006, 2008) suggested the formation constants for M 2 UO 2 (CO 3 ) 3 0 (M = Ca, Ba) and MUO 2 (CO 3 ) 3 2-(M = Mg, Ca, Sr, Ba) using anion exchange method. Instead of anion exchange method, Bernhard et al (2001) and Geipel et al (2008) used TRLFS to determine the formation constants of M 2 UO 2 (CO 3 ) 3 0 (M = Ca, Sr, Ba) and MUO 2 (CO 3 ) 3 2-(M = Mg, Ca, Sr, Ba). The latter research group was able to calculate log K value for Sr 2 UO 2 (CO 3 ) 3 0 .…”

Section: Data Evaluationmentioning

confidence: 99%

“…The latter research group was able to calculate log K value for Sr 2 UO 2 (CO 3 ) 3 0 . In order to compare the aqueous speciation calculation of anionic or zero-valent complexes of Mg, Ca, and Sr, calculations were done using PHREEQC with NEA_2007 database and the log K values added either from Dong and Brooks (2006) or Bernhard et al (2001) and Geipel et al (2008) and plotted in Fig. 1a-f.…”

Section: Data Evaluationmentioning

confidence: 99%

“…The beta emitter 90 Sr is a major pollutant together with U in the Hanford nuclear test site (USA), and other areas subjected by nuclear incidents (Standring et al 2002;Smith et al 2004). Geipel et al (2008) suggested the formation of MgUO 2 (CO 3 ) 3 2-as well as Mg 2 UO 2 (CO3) 3 0 on results using time-resolved laser-induced fluorescence spectroscopy (TRLFS) without, however, reporting formation constant for Mg 2 UO 2 (CO3) 3 0 . Brooks (2006, 2008) determined formation constant for MgUO 2 (CO 3 ) 3 2-using an anion exchange method.…”

mentioning

confidence: 99%

“…Brooks (2006, 2008) determined formation constant for MgUO 2 (CO 3 ) 3 2-using an anion exchange method. The formation of strontium uranyl carbonates were investigated and discussed, and formation constants were reported using anion exchange method (Dong and Brooks 2006), respectively, TRLFS (Geipel et al 2008).…”

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confidence: 99%

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Impact of Alkaline Earth Metals on Aqueous Speciation of Uranium(VI) and Sorption on Quartz

Nair

Merkel

2011

Aquat Geochem

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The effect of Mg-, Ca-, and Sr-Uranyl-Carbonato complexes with respect to sorption on quartz was studied by means of batch experiments with U(VI) concentration of 0.126 9 10 -6 M in the presence and absence of Mg, Ca, and Sr (each 1 mM) at pH from 6.5 to 9. In the absence of alkaline earth elements, 90% of the U(VI) sorbed on the quartz surface at all pH. In the presence of Mg, Ca, and Sr, the sorption of U(VI) on quartz decreased to 50, 10, and 30%, respectively. Sorption kinetics of U(VI) on quartz is faster in the absence of alkaline earth elements and reached equilibrium after 12 h, whereas in the presence of Mg, Ca and Sr, the kinetics of U(VI) sorption on quartz is pH dependent and attained equilibrium after 24 h. Aqueous speciation calculations for alkaline earth uranyl carbonates were carried out by using PHREEQC with the Nuclear Energy Agency thermodynamic database (NEA_2007) by adding constants for MUO 2 (CO 3 ) 3 2-and M 2 UO 2 (CO 3 ) 3 0 (M = Ca, Mg, Sr). This study reveals that alkaline earth elements can have a significant effect on the aqueous speciation of U(VI) under neutral to alkaline pH conditions and subsequently sorption behavior and mobility of U(VI) in aqueous environments.

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Laser‐Based Spectroscopic Studies of Actinide Complexes

Jung

Cho

Kim

et al. 2018

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The purpose of this article is to introduce laser spectroscopic studies for the chemical speciation of actinide complexes to those who are interested in the highly sensitive analytical techniques used in the nuclear industry. The chemical speciation of actinide complexes is considered to be a key concept for the safe management of spent nuclear fuels in the back‐end of a nuclear fuel cycle. Time‐resolved laser fluorescence spectroscopy (TRLFS) and laser‐induced photoacoustic spectroscopy (LPAS) are accepted as very effective techniques to analyze trace amounts of actinide complexes in aqueous solutions. In the present case study, TRLFS and LPAS are primarily used for the chemical speciation of U(VI)‐ and Pu(VI)‐hydroxo complexes, respectively. For the practical application of TRLFS, the chemical speciation of trace amounts of Ca–U(VI)‐carbonate species dissolved in groundwater is described. A spectrophotometry coupled with a liquid waveguide capillary cell is applied for the chemical speciation of U(IV)‐hydroxo complex as an alternative technique to LPAS. The absorption and luminescence characteristics of Am(III) species are also described.

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Mixed complexes of alkaline earth uranyl carbonates: A laser-induced time-resolved fluorescence spectroscopic study

Cited by 64 publications

References 17 publications

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Impact of Alkaline Earth Metals on Aqueous Speciation of Uranium(VI) and Sorption on Quartz

Laser‐Based Spectroscopic Studies of Actinide Complexes

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