Raman spectroscopic determination of the speciation of ore metals in hydrothermal solutions. I. Speciation of antimony in alkaline sulfide solutions at 25 degree C

Conference · Wed Feb 01 00:00:00 EST 1989 · Geochimica et Cosmochimica Acta; (USA)

OSTI ID:5195664

Wood, S A ^[1]

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1. McGill Univ., Montreal, Quebec (Canada)

The Raman spectra of the thio-antimony species present in alkaline Na{sub 2}S solutions were obtained at 25{degree}C. The Na{sub 2}S concentration of the solutions was approximately 1.0 molal and the Sb concentrations ranged from 0.005 to 0.1 molal. The spectrum in 0.1 molal Sb solutions consists of a broad, weak band at 314 cm{sup {minus}1}, a more intense band at 369 cm{sup {minus}1}, and prominent shoulder at approximately 350 cm{sup {minus}1} and a suggestion of a shoulder near 380 cm{sup {minus}1}. All of these bands are polarized. An additional line is observed at 2,574 cm{sup {minus}1} due to the H-S stretch of HS{sup {minus}}. The observed Raman spectrum is consistent with either Sb{sub 2}S{sup 2{minus}}{sub 7}, but the former is preferred based on the small number of bands observed. The spectra of solutions at Sb concentrations of 0.06 or less consist of a polarized band at 369 cm{sup {minus}1} and a polarized shoulder at approximately 380 cm{sup {minus}1}. These spectra are consistent with either a bend SbS{sup {minus}}{sub 2} or a pyramidal SbS{sup 3{minus}}{sub 3} species. The present data suggest that the thioantimony species present in most geological fluids, which are generally at higher temperatures, lower pH and contain lower Sb contents than those employed in this study, will be monomeric rather than polymeric. Most previous experimental reports of polymeric species, based solely on solubility or potentiometric studies, and any thermodynamic data derived from these studies, are suspect.

• OSTI ID: 5195664
• Report Number(s): CONF-8802153-; CODEN: GCACA
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Vol. 53:2; Conference: 3. international conference of the Mineral Exploration Research Institute: experimental investigations of hydrothermal processes: applications to ore deposit genesis, Montreal (Canada), 10-12 Feb 1988; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
58 GEOSCIENCES
GEOTHERMAL FLUIDS
ANTIMONY COMPOUNDS
CHEMICAL COMPOSITION
MINERALIZATION
SODIUM SULFIDES
HYDROTHERMAL SYSTEMS
ROCK-FLUID INTERACTIONS
GEOCHEMISTRY
HYDROTHERMAL SYNTHESIS
PH VALUE
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SOLUBILITY
STRUCTURAL CHEMICAL ANALYSIS
THERMODYNAMIC PROPERTIES
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMISTRY
ENERGY SYSTEMS
FLUIDS
GEOTHERMAL SYSTEMS
LASER SPECTROSCOPY
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SPECTRA
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
152003* - Geothermal Data & Theory- Rock-Water-Gas Interactions
580000 - Geosciences