Organic species of lanthanum in natural environments: Implications to mobility of rare earth elements in low temperature environments

Xiong, Yongliang

doi:10.1016/j.apgeochem.2011.04.003

Cited by 20 publications

(16 citation statements)

References 26 publications

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“…In comparison, both log β 101 of 9.91 ± 0.10 in NaClO 4 medium alone and log β 101 of 9.56 ± 0.35 in NaClO 4 and NaCl media for Am(Cit) evaluated in this study are significantly higher than the value of 8.850 ± 0.200 reported by Hummel et al [23]. However, the log β 101 of (9.82 ± 0.14) for Eu(Cit) obtained in this study agrees reasonably well with the predicted value of 10.38 ± 0.24 [24], considering the quoted uncertainties. Furthermore, the log β 102 (14.47 ± 0.14) for Am(Cit) 2 3− determined in this study agrees well with the reported value of 13.900 ± 1.000 [23] within the quoted uncertainties.…”

Section: Calculation Of Pitzer Parameterssupporting

confidence: 86%

Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO₄media

Thakur

Xiong

Borkowski³

et al. 2011

Radiochimica Acta

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Citric acid dissociation constants / Am-Cm-Eu-citrate complexation / Pitzer parameters / Extraction / High ionic strengthSummary. The dissociation constants of citric acid (Cit), and the stability constants of Am 3+ , Cm 3+ and Eu 3+ with Cit were determined as a function of ionic strength (NaClO 4 ) using potentiometric titration and an extraction technique, respectively. The results have shown the presence of both 1 : 1 and 1 : 2 complexes under the experimental conditions. A thermodynamic model was constructed to predict the apparent stability constants at different ionic strengths by applying the Pitzer ionic interaction parameters β (0) , β (1) , and C φ which were obtained to fit the experimental data. Thermodynamic stability constants of M(Cit) and M(Cit) 2 3− (where M = Am 3+ , Cm 3+ or Eu 3+ ) were calculated to be log β 0 101 = 9.91 ± 0.10, log β 0 102 = 14.47 ± 0.14 for Am 3+ , log β 0 101 = 9.53 ± 0.16, log β 0 102 = 14.46 ± 0.16 for Cm 3+ and log β 0 101 = 9.82 ± 0.14, log β 0 102 = 13.31 ± 0.12 for Eu 3+ as obtained by extrapolation to zero ionic strength.

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Section: Calculation Of Pitzer Parameterssupporting

confidence: 86%

Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO₄media

Thakur

Xiong

Borkowski³

et al. 2011

Radiochimica Acta

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“…Similar binding sites have been demonstrated as powerful ligands favouring REE migrations in a wide range of physical-chemical conditions (Loges et al, 2012;Sonke and Salters, 2006;Xiong, 2011). Cations involved in migration processes through the xylem of grapevines are complexed with organic acids by means of polar bindings (Taiz and Zeiger, 2006) occurring between O-donor groups and REE 3+ , as demonstrated during hydroponic growth (Ding et al, 2006), mainly carboxyl or phosphate groups (Takahashi et al, 2010).…”

Section: Aerial Portionsmentioning

confidence: 83%

Geochemical behaviour of rare earths in Vitis vinifera grafted onto different rootstocks and growing on several soils

Censi¹,

Saiano²,

Pisciotta³

et al. 2014

Science of The Total Environment

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The geochemical behaviour of lanthanides and yttrium (Rare Earth Elements, REEs) has been investigated mainly in geological systems where these elements represent the best proxies of processes involving the occurrence of an interface between different media. This behaviour is assessed according to features recorded in sequences of REE concentrations along the REE series normalised with respect to a reference material. In this study, the geochemical behaviour of REE was investigated in different parts of Vitis vinifera specimens grown off-soil, on soils of different nature and grafted onto several rootstocks in order to evaluate effects induced by these changes. The results indicated that roots are the plant organs where REEs are preferentially concentrated, in particular elements from Sm to Ho (middle REE, MREE) whereas Eu enrichments occur in aerial parts. The geochemical behaviour of REE suggests that MREE enrichments in roots are due to preferential MREE interactions with biological membranes or to surface complexation with newly formed phosphates. Eu-positive anomalies suggest that Eu(3+) can form stable organic complexes in place of Ca(2+) in several biological processes in xylem fluids. The possibility that Eu mobility in these fluids can be enhanced by its reductive speciation as Eu(2+) cannot be ruled out. The assessment of the geochemical behaviour of REE according to the theory of the Tetrad Effect carried out confirms that REEs coming from soil are scavenged onto root tissues or mineral surfaces whereas their behaviour in aerial parts of V. vinifera is driven by dissolved complexation.

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“…Conversely, Davranche et al (2011) reported middle (M)REE downward concavity patterns in soil solutions during wetland soil reduction, attributing to DOM a tendency to concentrate MREE. In either case, REYligand complexation affects non-stoichiometric dissolution of primary minerals (Goyne et al, 2010) and the effective solubilization and transport of complexed REY in natural waters (Xiong, 2011).…”

Section: Introductionmentioning

confidence: 99%

Rare earth elements as reactive tracers of biogeochemical weathering in forested rhyolitic terrain

et al. 2015

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Organic species of lanthanum in natural environments: Implications to mobility of rare earth elements in low temperature environments

Cited by 20 publications

References 26 publications

Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO₄media

Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO₄media

Geochemical behaviour of rare earths in Vitis vinifera grafted onto different rootstocks and growing on several soils

Rare earth elements as reactive tracers of biogeochemical weathering in forested rhyolitic terrain

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Organic species of lanthanum in natural environments: Implications to mobility of rare earth elements in low temperature environments

Cited by 20 publications

References 26 publications

Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO4media

Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO4media

Geochemical behaviour of rare earths in Vitis vinifera grafted onto different rootstocks and growing on several soils

Rare earth elements as reactive tracers of biogeochemical weathering in forested rhyolitic terrain

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Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO₄media

Thermodynamic modeling of trivalent Am, Cm and Eu-citrate complexation in concentrated NaClO₄media