A spectrophotometric study of samarium (III) speciation in chloride solutions at elevated temperatures

被引：26

作者：

Migdisov, Art. A. ^{[1
]}

Williams-Jones, A. E. ^{[1
]}

Normand, C. ^{[2
]}

Wood, S. A. ^{[2
]}

机构：

[1] McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ H3A 2A7, Canada

[2] Univ Idaho, Dept Geol Sci, Moscow, ID 83844 USA

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 2008年 / 72卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/j.gca.2008.01.007

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The speciation of samarium (III) in chloride-bearing solutions was investigated spectrophotometrically at temperatures of 100-250 degrees C and a pressure of 100 bars. The simple hydrated ion, Sm3+, is predominant at ambient temperature, but chloride complexes are the dominant species at elevated temperatures. Cumulative formation constants for samarium chloride species were calculated for the following reactions: Sm3+ + Cl- = SmCl2+ beta(1) Sm3+ + 2Cl(-) = SmCl2+ beta(2) Within experimental error, the values for the first formation constant (fit), are identical to the values predicted by Haas et al. [Haas J. R., Shock E. L. and Sassani D. C. (1995) Rare earth elements in hydrothermal systems: estimates of standard partial molal thermodynamic properties of aqueous complexes of the rare earth elements at high pressures and temperatures. Geochim. Cosmochim. Acta, 59, 4329-4350]. The values for the second formation constant (beta(2)) at 200 and 250 degrees C are in fair agreement with those of Haas et al. (1995) and Gammons et al. [Gammons C. H., Wood S. A. and Li Y. (2002) Complexation of the rare earth elements with aqueous chloride at 200 degrees C and 300 degrees C and saturated water vapor pressure. Special Publication - The Geochemical Society, (Water-Rock Interactions, Ore Deposits, and Environmental Geochemistry), pp. 191-207]. Calculations of monazite solubility indicate that Sm is less mobile in chloride-bearing solutions than Nd, which may indicate that the HREE are less mobile than the LREE. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1611 / 1625

页数：15

共 39 条

[1]

ART AM, 2007, GEOCHIM COSMOCHIM AC, V71, P3056

[2]

ART AM, 2006, GEOCHIM COSMOCHIM AC, V70, P983

[3]

ART AM, 2006, CHEM GEOL, V234, P17

[4] REE COMPOSITION OF AN AQUEOUS MAGMATIC FLUID - A FLUID INCLUSION STUDY FROM THE CAPITAN PLUTON, NEW-MEXICO, USA [J].

BANKS, DA ;

YARDLEY, BWD ;

CAMPBELL, AR ;

JARVIS, KE .

CHEMICAL GEOLOGY, 1994, 113 (3-4) :259-272

[5] Extraction of chemical speciation and molar absorption coefficients with well-posed solutions of Beer's law [J].

Boily, Jean-Francois ;

Suleimenov, Oleg M. .

JOURNAL OF SOLUTION CHEMISTRY, 2006, 35 (06) :917-926

[6]

CHAO ECT, 1997, B US GEOLOGICAL SURV, V2143

[7]

CHOPPIN GR, 1966, 0RO17972 AEC

[8]

Dennis J.E., 1987, NEW COMPUTING ENV MI, P116

[9] THE BAYAN OBO IRON RARE-EARTH NIOBIUM DEPOSITS, INNER-MONGOLIA, CHINA [J].

DREW, LJ ;

QINGRUN, M ;

WEIJUN, S .

LITHOS, 1990, 26 (1-2) :43-65

[10] The aqueous geochemistry of the rare earth elements and yttrium .6. Stability of neodymium chloride complexes from 25 to 300 degrees C [J].

Gammons, CH ;

Wood, SA ;

WilliamsJones, AE .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1996, 60 (23) :4615-4630

← 1 2 3 4 →