A spectrophotometric study of aqueous iron (II) chloride complexing from 25 to 200 degree C
Journal Article
·
· Geochimica et Cosmochimica Acta; (USA)
- Bureau of Mineral Resources, Canberra (Australia)
- Department of Scientific and Industrial Research, Petone (New Zealand)
Ultraviolet absorption spectra of solutions in the system FeCl{sub 2}-HCl-H{sub 2}O with chloride concentrations ranging from 0.01 to 3.4 m and Fe(II) concentrations ranging from 0.005 to 0.025 m have been measured at 25, 50, 100, 150, and 200{degree}C and the equilibrium saturation vapor pressure of the system. Non-linear least squares regression was used to estimate cumulative thermodynamic association constants and molar absorptivities. At 25, 50, and 100{degree}C, only Fe{sup 2+} and FeCl{sup +} are detectable, whereas at higher temperatures a minor concentration of a third species, interpreted to be FeCl{sup 0}{sub 2}, starts to contribute substantially to total absorbance. Recommended values of the association constants, {beta}{sub 1} and {beta}{sub 2}, for the equilibria Fe{sup 2+} + Cl{sup {minus}} = FeCl{sup +} and Fe{sup 2+} + 2Cl{sup {minus}} = FeCl{sup 0}{sub 2} are given. In combination with published thermodynamic data for the Fe-S-O-H system, the equilibrium formation constants are used to calculate solubilities of selected Fe mineral assemblages in NaCl-rich hydrothermal solutions. The results are in satisfactory agreement with published analytical data from basinal brines and geothermal fluids.
- OSTI ID:
- 6265223
- Journal Information:
- Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 54:8; ISSN GCACA; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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Thermodynamic properties of aqueous species and the solubilities of minerals at high pressures and temperatures: The system Fe-O-S-H[sub 2]O-NaCl
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Tue Dec 31 23:00:00 EST 1991
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5690869
Solubility-product constant and thermodynamic properties for synthetic otavite, CdCO[sub 3(s)], and aqueous association constants for the Cd(II)-CO[sub 2]-H[sub 2]O system
Journal Article
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·
OSTI ID:6457122
Related Subjects
15 GEOTHERMAL ENERGY
152001* -- Geothermal Data & Theory-- Properties of Aqueous Solutions
58 GEOSCIENCES
580000 -- Geosciences
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
CHARGED PARTICLES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
CONCENTRATION RATIO
DISSOLUTION
ENERGY
ENERGY SYSTEMS
EQUILIBRIUM
FLUIDS
GEOCHEMISTRY
GEOTHERMAL FLUIDS
GEOTHERMAL SYSTEMS
HALIDES
HALOGEN COMPOUNDS
HYDROTHERMAL SYSTEMS
IONS
IRON CHLORIDES
IRON COMPLEXES
IRON COMPOUNDS
IRON IONS
PHYSICAL PROPERTIES
PRESSURE EFFECTS
SATURATION
SOLUBILITY
SPECTRA
SPECTROSCOPY
TEMPERATURE EFFECTS
THERMODYNAMIC ACTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET SPECTRA
VAPOR PRESSURE
152001* -- Geothermal Data & Theory-- Properties of Aqueous Solutions
58 GEOSCIENCES
580000 -- Geosciences
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
CHARGED PARTICLES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
CONCENTRATION RATIO
DISSOLUTION
ENERGY
ENERGY SYSTEMS
EQUILIBRIUM
FLUIDS
GEOCHEMISTRY
GEOTHERMAL FLUIDS
GEOTHERMAL SYSTEMS
HALIDES
HALOGEN COMPOUNDS
HYDROTHERMAL SYSTEMS
IONS
IRON CHLORIDES
IRON COMPLEXES
IRON COMPOUNDS
IRON IONS
PHYSICAL PROPERTIES
PRESSURE EFFECTS
SATURATION
SOLUBILITY
SPECTRA
SPECTROSCOPY
TEMPERATURE EFFECTS
THERMODYNAMIC ACTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET SPECTRA
VAPOR PRESSURE