Solubility Model for Ferrous Iron Hydroxide, Hibbingite, Siderite, and Chukanovite in High Saline Solutions of Sodium Chloride, Sodium Sulfate, and Sodium Carbonate
| Autor: | Cassandra Marrs, Jay Je-Hun Jang, Sungtae Kim, Martin B. Nemer |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Activity coefficient
Atmospheric Science Aqueous solution Sodium Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010502 geochemistry & geophysics 021001 nanoscience & nanotechnology 01 natural sciences Ferrous chemistry.chemical_compound chemistry Space and Planetary Science Geochemistry and Petrology Sodium sulfate Hydroxide Solubility 0210 nano-technology Sodium carbonate 0105 earth and related environmental sciences |
| Zdroj: | ACS Earth and Space Chemistry. 1:647-663 |
| ISSN: | 2472-3452 |
| DOI: | 10.1021/acsearthspacechem.7b00065 |
| Popis: | A solubility model is presented for ferrous iron hydroxide (Fe(OH)2(s)), hibbingite (Fe2Cl(OH)3(s)), siderite (FeCO3(s)), and chukanovite (Fe2CO3(OH)2(s)). The Pitzer activity coefficient equation was utilized in developing the model to account for the excess free energies of aqueous species in the background solutions of high ionic strength. Solubility limiting minerals were analyzed before and after experiments using X-ray diffraction. Formation of Fe(OH)2(s) was observed in the experiments that were initiated with Fe2Cl(OH)3(s) in Na2SO4 solution. Coexistence of siderite and chukanovite was observed in the experiments in Na2CO3 + NaCl solutions. Two equilibrium constants that had been reported by us for the dissolution of Fe(OH)2(s) and Fe2Cl(OH)3(s) (Nemer et al.) were rederived in this paper, using newer thermodynamic data selected from the literature to maintain internal consistency of the series of our data analyses in preparation, including this paper. Three additional equilibrium constants for th... |
| Databáze: | OpenAIRE |
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