An experimental study of the aqueous solubility and speciation of Y(III) fluoride at temperatures up to 250°C

A. Loges, A.A. Migdisov, Thomas Wagner, A.E. Williams-Jones, G. Markl

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The solubility of Yttrium (III) fluoride as a function of fluoride activity was investigated experimentally at 100, 150, 200 and 250°C and vapor-saturated water pressure. Data obtained from the experiments were used to determine the solubility product of YF3(s), the fluoride speciation of Y and the stability constants of the corresponding complexes. The dominant Y-fluoride species at the temperatures investigated is the di-fluoride complex (YF2+). Consequently, fluoride speciation of Y differs substantially from that of the lanthanides (Ln), which dominantly form mono-fluoride complexes (LnF2+). The solubility product of YF3(s) is -20.8 ± 0.50, -21.5 ± 0.46, -22.4 ± 0.56 and -24.3 ± 0.12 at 100, 150, 200 and 250°C, respectively. The formation constant of YF2+ is 8.3 ± 0.77, 10.7 ± 0.43, 12.1 ± 0.31 and 13.3 ± 0.16 at the same temperatures, respectively. Differences in the speciation of Y from that of the lanthanide, holmium (Ho), quantitatively explain the fractionation between these geochemical twin elements, a feature which has been reported for many fluoride-rich hydrothermal systems. Our results emphasize the usefulness of the Y/Ho ratio as a geochemical indicator in hydrothermal systems.

Originalspråkengelska
TidskriftGeochimica et Cosmochimica Acta
Volym123
Sidor (från-till)403-415
Antal sidor13
ISSN0016-7037
DOI
StatusPublicerad - 2013
MoE-publikationstypA1 Tidskriftsartikel-refererad

Vetenskapsgrenar

  • 1171 Geovetenskaper

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title = "An experimental study of the aqueous solubility and speciation of Y(III) fluoride at temperatures up to 250°C",
abstract = "The solubility of Yttrium (III) fluoride as a function of fluoride activity was investigated experimentally at 100, 150, 200 and 250°C and vapor-saturated water pressure. Data obtained from the experiments were used to determine the solubility product of YF3(s), the fluoride speciation of Y and the stability constants of the corresponding complexes. The dominant Y-fluoride species at the temperatures investigated is the di-fluoride complex (YF2+). Consequently, fluoride speciation of Y differs substantially from that of the lanthanides (Ln), which dominantly form mono-fluoride complexes (LnF2+). The solubility product of YF3(s) is -20.8 ± 0.50, -21.5 ± 0.46, -22.4 ± 0.56 and -24.3 ± 0.12 at 100, 150, 200 and 250°C, respectively. The formation constant of YF2+ is 8.3 ± 0.77, 10.7 ± 0.43, 12.1 ± 0.31 and 13.3 ± 0.16 at the same temperatures, respectively. Differences in the speciation of Y from that of the lanthanide, holmium (Ho), quantitatively explain the fractionation between these geochemical twin elements, a feature which has been reported for many fluoride-rich hydrothermal systems. Our results emphasize the usefulness of the Y/Ho ratio as a geochemical indicator in hydrothermal systems.",
keywords = "1171 Geosciences",
author = "A. Loges and A.A. Migdisov and Thomas Wagner and A.E. Williams-Jones and G. Markl",
year = "2013",
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pages = "403--415",
journal = "Geochimica et Cosmochimica Acta",
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An experimental study of the aqueous solubility and speciation of Y(III) fluoride at temperatures up to 250°C. / Loges, A.; Migdisov, A.A.; Wagner, Thomas; Williams-Jones, A.E.; Markl, G.

I: Geochimica et Cosmochimica Acta, Vol. 123, 2013, s. 403-415.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - An experimental study of the aqueous solubility and speciation of Y(III) fluoride at temperatures up to 250°C

AU - Loges, A.

AU - Migdisov, A.A.

AU - Wagner, Thomas

AU - Williams-Jones, A.E.

AU - Markl, G.

PY - 2013

Y1 - 2013

N2 - The solubility of Yttrium (III) fluoride as a function of fluoride activity was investigated experimentally at 100, 150, 200 and 250°C and vapor-saturated water pressure. Data obtained from the experiments were used to determine the solubility product of YF3(s), the fluoride speciation of Y and the stability constants of the corresponding complexes. The dominant Y-fluoride species at the temperatures investigated is the di-fluoride complex (YF2+). Consequently, fluoride speciation of Y differs substantially from that of the lanthanides (Ln), which dominantly form mono-fluoride complexes (LnF2+). The solubility product of YF3(s) is -20.8 ± 0.50, -21.5 ± 0.46, -22.4 ± 0.56 and -24.3 ± 0.12 at 100, 150, 200 and 250°C, respectively. The formation constant of YF2+ is 8.3 ± 0.77, 10.7 ± 0.43, 12.1 ± 0.31 and 13.3 ± 0.16 at the same temperatures, respectively. Differences in the speciation of Y from that of the lanthanide, holmium (Ho), quantitatively explain the fractionation between these geochemical twin elements, a feature which has been reported for many fluoride-rich hydrothermal systems. Our results emphasize the usefulness of the Y/Ho ratio as a geochemical indicator in hydrothermal systems.

AB - The solubility of Yttrium (III) fluoride as a function of fluoride activity was investigated experimentally at 100, 150, 200 and 250°C and vapor-saturated water pressure. Data obtained from the experiments were used to determine the solubility product of YF3(s), the fluoride speciation of Y and the stability constants of the corresponding complexes. The dominant Y-fluoride species at the temperatures investigated is the di-fluoride complex (YF2+). Consequently, fluoride speciation of Y differs substantially from that of the lanthanides (Ln), which dominantly form mono-fluoride complexes (LnF2+). The solubility product of YF3(s) is -20.8 ± 0.50, -21.5 ± 0.46, -22.4 ± 0.56 and -24.3 ± 0.12 at 100, 150, 200 and 250°C, respectively. The formation constant of YF2+ is 8.3 ± 0.77, 10.7 ± 0.43, 12.1 ± 0.31 and 13.3 ± 0.16 at the same temperatures, respectively. Differences in the speciation of Y from that of the lanthanide, holmium (Ho), quantitatively explain the fractionation between these geochemical twin elements, a feature which has been reported for many fluoride-rich hydrothermal systems. Our results emphasize the usefulness of the Y/Ho ratio as a geochemical indicator in hydrothermal systems.

KW - 1171 Geosciences

U2 - 10.1016/j.gca.2013.07.031

DO - 10.1016/j.gca.2013.07.031

M3 - Article

VL - 123

SP - 403

EP - 415

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

SN - 0016-7037

ER -