Carbonate Complexation of Yttrium and the Rare Earth Elements in Natural Waters

Yu-Ran Luo; Robert H. Byrne

doi:10.1016/S0016-7037(03)00495-2

Carbonate Complexation of Yttrium and the Rare Earth Elements in Natural Waters

Yu-Ran Luo, Robert H. Byrne

College of Marine Science

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Abstract

Potentiometric measurements of Yttrium and Rare Earth Element (YREE) complexation by carbonate and bicarbonate indicate that the quality of carbonate complexation constants previously obtained via solvent exchange analyses are superior to characterizations obtained using solubility and adsorptive exchange analyses. The results of our analyses at 25°C are combined with the results of previous solvent exchange analyses to obtain YREE carbonate complexation constants over a wide range of ionic strength (0 ≤ I ≤3 molal). YREE carbonate complexation constants are reported for the following equilibria, M 3+ +nHCO 3 − &rlhar;M(CO 3 ) n 3−2n +nH + , where n = 1 or 2. Formation constants written in terms of HCO 3 − concentrations require only minor corrections for ion pairing relative to the corrections required for constants expressed in terms of CO 3 2− concentrations. Formation constants for the above complexation equilibria, CO 3 H β 1 =[MCO 3 + ][H + ][M 3+ ] −1 [HCO 3 − ] −1 and CO 3 H β 2 =[M(CO 3 ) 2 − ][H + ] 2 [M 3+ ] −1 [HCO 3 − ] −2 , have very similar dependencies on ionic strength because the reaction MCO 3 + +HCO 3 − &rlhar;M(CO 3 ) 2 − +H + is isocoulombic. Potentiometric analyses indicate that the dependence of log CO 3 H β 1 and log CO 3 H β 2 on ionic strength at 25°C is given as (A)logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I">logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I where CO 3 H β n 0 denotes a formation constant at 25°C and zero ionic strength. Recommended values for log CO3 H β 1 and log CO 3 H β 2 0 , expressed in the form (element, −log CO 3 H β 1 0 , −log CO 3 H β 2 0 ), are as follows: (Y, 2.85, 8.03), (La, 3.60, 9.36), (Ce, 3.27, 8.90), (Pr, 3.10, 8.58), (Nd, 3.05, 8.49), (Sm, 2.87, 8.13), (Eu, 2.85, 8.03), (Gd, 2.94, 8.18), (Tb, 2.87, 7.88), (Dy, 2.77, 7.75), (Ho, 2.78, 7.66), (Er, 2.72, 7.54), (Tm, 2.65, 7.39), (Yb, 2.53, 7.36), (Lu, 2.58, 7.29).

Original language	American English
Journal	Geochimica et Cosmochimica Acta
Volume	68
DOIs	https://doi.org/10.1016/S0016-7037(03)00495-2
State	Published - Jan 1 2004

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@article{6b74edfa595046c8b0780a3787648d32,

title = "Carbonate Complexation of Yttrium and the Rare Earth Elements in Natural Waters",

abstract = " Potentiometric measurements of Yttrium and Rare Earth Element (YREE) complexation by carbonate and bicarbonate indicate that the quality of carbonate complexation constants previously obtained via solvent exchange analyses are superior to characterizations obtained using solubility and adsorptive exchange analyses. The results of our analyses at 25°C are combined with the results of previous solvent exchange analyses to obtain YREE carbonate complexation constants over a wide range of ionic strength (0 ≤ I ≤3 molal). YREE carbonate complexation constants are reported for the following equilibria, M 3+ +nHCO 3 − &rlhar;M(CO 3 ) n 3−2n +nH + , where n = 1 or 2. Formation constants written in terms of HCO 3 − concentrations require only minor corrections for ion pairing relative to the corrections required for constants expressed in terms of CO 3 2− concentrations. Formation constants for the above complexation equilibria, CO 3 H β 1 =[MCO 3 + ][H + ][M 3+ ] −1 [HCO 3 − ] −1 and CO 3 H β 2 =[M(CO 3 ) 2 − ][H + ] 2 [M 3+ ] −1 [HCO 3 − ] −2 , have very similar dependencies on ionic strength because the reaction MCO 3 + +HCO 3 − &rlhar;M(CO 3 ) 2 − +H + is isocoulombic. Potentiometric analyses indicate that the dependence of log CO 3 H β 1 and log CO 3 H β 2 on ionic strength at 25°C is given as (A)logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I{"}>logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I where CO 3 H β n 0 denotes a formation constant at 25°C and zero ionic strength. Recommended values for log CO3 H β 1 and log CO 3 H β 2 0 , expressed in the form (element, −log CO 3 H β 1 0 , −log CO 3 H β 2 0 ), are as follows: (Y, 2.85, 8.03), (La, 3.60, 9.36), (Ce, 3.27, 8.90), (Pr, 3.10, 8.58), (Nd, 3.05, 8.49), (Sm, 2.87, 8.13), (Eu, 2.85, 8.03), (Gd, 2.94, 8.18), (Tb, 2.87, 7.88), (Dy, 2.77, 7.75), (Ho, 2.78, 7.66), (Er, 2.72, 7.54), (Tm, 2.65, 7.39), (Yb, 2.53, 7.36), (Lu, 2.58, 7.29).",

author = "Yu-Ran Luo and Byrne, {Robert H.}",

year = "2004",

month = jan,

day = "1",

doi = "10.1016/S0016-7037(03)00495-2",

language = "American English",

volume = "68",

journal = "Geochimica et Cosmochimica Acta",

}

TY - JOUR

T1 - Carbonate Complexation of Yttrium and the Rare Earth Elements in Natural Waters

AU - Luo, Yu-Ran

AU - Byrne, Robert H.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - Potentiometric measurements of Yttrium and Rare Earth Element (YREE) complexation by carbonate and bicarbonate indicate that the quality of carbonate complexation constants previously obtained via solvent exchange analyses are superior to characterizations obtained using solubility and adsorptive exchange analyses. The results of our analyses at 25°C are combined with the results of previous solvent exchange analyses to obtain YREE carbonate complexation constants over a wide range of ionic strength (0 ≤ I ≤3 molal). YREE carbonate complexation constants are reported for the following equilibria, M 3+ +nHCO 3 − &rlhar;M(CO 3 ) n 3−2n +nH + , where n = 1 or 2. Formation constants written in terms of HCO 3 − concentrations require only minor corrections for ion pairing relative to the corrections required for constants expressed in terms of CO 3 2− concentrations. Formation constants for the above complexation equilibria, CO 3 H β 1 =[MCO 3 + ][H + ][M 3+ ] −1 [HCO 3 − ] −1 and CO 3 H β 2 =[M(CO 3 ) 2 − ][H + ] 2 [M 3+ ] −1 [HCO 3 − ] −2 , have very similar dependencies on ionic strength because the reaction MCO 3 + +HCO 3 − &rlhar;M(CO 3 ) 2 − +H + is isocoulombic. Potentiometric analyses indicate that the dependence of log CO 3 H β 1 and log CO 3 H β 2 on ionic strength at 25°C is given as (A)logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I">logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I where CO 3 H β n 0 denotes a formation constant at 25°C and zero ionic strength. Recommended values for log CO3 H β 1 and log CO 3 H β 2 0 , expressed in the form (element, −log CO 3 H β 1 0 , −log CO 3 H β 2 0 ), are as follows: (Y, 2.85, 8.03), (La, 3.60, 9.36), (Ce, 3.27, 8.90), (Pr, 3.10, 8.58), (Nd, 3.05, 8.49), (Sm, 2.87, 8.13), (Eu, 2.85, 8.03), (Gd, 2.94, 8.18), (Tb, 2.87, 7.88), (Dy, 2.77, 7.75), (Ho, 2.78, 7.66), (Er, 2.72, 7.54), (Tm, 2.65, 7.39), (Yb, 2.53, 7.36), (Lu, 2.58, 7.29).

AB - Potentiometric measurements of Yttrium and Rare Earth Element (YREE) complexation by carbonate and bicarbonate indicate that the quality of carbonate complexation constants previously obtained via solvent exchange analyses are superior to characterizations obtained using solubility and adsorptive exchange analyses. The results of our analyses at 25°C are combined with the results of previous solvent exchange analyses to obtain YREE carbonate complexation constants over a wide range of ionic strength (0 ≤ I ≤3 molal). YREE carbonate complexation constants are reported for the following equilibria, M 3+ +nHCO 3 − &rlhar;M(CO 3 ) n 3−2n +nH + , where n = 1 or 2. Formation constants written in terms of HCO 3 − concentrations require only minor corrections for ion pairing relative to the corrections required for constants expressed in terms of CO 3 2− concentrations. Formation constants for the above complexation equilibria, CO 3 H β 1 =[MCO 3 + ][H + ][M 3+ ] −1 [HCO 3 − ] −1 and CO 3 H β 2 =[M(CO 3 ) 2 − ][H + ] 2 [M 3+ ] −1 [HCO 3 − ] −2 , have very similar dependencies on ionic strength because the reaction MCO 3 + +HCO 3 − &rlhar;M(CO 3 ) 2 − +H + is isocoulombic. Potentiometric analyses indicate that the dependence of log CO 3 H β 1 and log CO 3 H β 2 on ionic strength at 25°C is given as (A)logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I">logCO3Hβn=logCO3Hβn0−4.088I0.5/(1+3.033I0.5)+0.042I where CO 3 H β n 0 denotes a formation constant at 25°C and zero ionic strength. Recommended values for log CO3 H β 1 and log CO 3 H β 2 0 , expressed in the form (element, −log CO 3 H β 1 0 , −log CO 3 H β 2 0 ), are as follows: (Y, 2.85, 8.03), (La, 3.60, 9.36), (Ce, 3.27, 8.90), (Pr, 3.10, 8.58), (Nd, 3.05, 8.49), (Sm, 2.87, 8.13), (Eu, 2.85, 8.03), (Gd, 2.94, 8.18), (Tb, 2.87, 7.88), (Dy, 2.77, 7.75), (Ho, 2.78, 7.66), (Er, 2.72, 7.54), (Tm, 2.65, 7.39), (Yb, 2.53, 7.36), (Lu, 2.58, 7.29).

UR - https://digitalcommons.usf.edu/msc_facpub/1739

UR - https://doi.org/10.1016/S0016-7037(03)00495-2

U2 - 10.1016/S0016-7037(03)00495-2

DO - 10.1016/S0016-7037(03)00495-2

M3 - Article

VL - 68

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

ER -

Carbonate Complexation of Yttrium and the Rare Earth Elements in Natural Waters

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