Solubility of jarosite at 4–35 °C

Baron, Dirk; Palmer, Carl D.

doi:10.1016/0016-7037(95)00392-4

Cited by 231 publications

(132 citation statements)

References 12 publications

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“…2a) are similar to those previously reported (Powers et al, 1975;Serna et al, 1986;Baron and Palmer, 1996;Sasaki et al, 1998;Drouet and Navrotsky, 2003). The intense absorption observed in the region 2900 to 3700 cm -1 can be attributed to O-H stretching (v OH ).…”

Section: Characterisation Of Synthetic Jarositesupporting

confidence: 89%

“…Both acidic dissolution batch experiments, which mimic environments affected by ARD/AMD, and alkaline dissolution batch experiments, which mimic ARD/AMD environments recently remediated with slaked lime (Ca(OH) 2 ), were carried out following the procedure of Baron and Palmer (1996).…”

Section: Dissolution Experimentsmentioning

confidence: 99%

“…Activity coefficients and saturation indices were calculated using the extended form of the Debye-Hückel equation described by Helgeson (1969) and the latest form of the GWB thermodynamic database (based on the 1996 revision of the EQ3/6 database; Wolery, 1979Wolery, , 1996 and data from Baron and Palmer, 1996). Eh versus pH diagrams were constructed in GWB using the measured equilibrium activities from bottle 2 of the acid dissolution experiments, and bottle 1 of the alkali dissolution experiments.…”

Section: Dissolution Experimentsmentioning

confidence: 99%

“…The molecular composition of the synthetic jarosite, calculated using the modified formula of Kubisz (1970) Baron and Palmer, 1996), except for the low Fe occupation at the B-site [i.e., 2.46 in this study, compared to an ideal of 3.00]. The large number of Fe vacancies can explain the lower than expected c-axis value for the synthetic jarosite, and supports the hypothesis of structural defects in the A-and B-sites proposed by Kubisz (1970).…”

Section: Characterisation Of Synthetic Jarositementioning

confidence: 99%

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Dissolution of jarosite [KFe3(SO4)2(OH)6] at pH 2 and 8: Insights from batch experiments and computational modelling

Smith

Hudson‐Edwards

Dubbin

et al. 2006

Geochimica et Cosmochimica Acta

129

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Jarosite [KFe 3 (SO 4 ) 2 (OH) 6 ] is a mineral that is common in acidic, sulphate-rich environments, such as acid sulphate soils derived from pyrite-bearing sediments, weathering zones of sulphide ore deposits and acid mine or acid rock drainage (ARD/AMD) sites. The structure of jarosite is based on linear tetrahedral-octahedral-tetrahedral (T-O-T) sheets, made up from slightly distorted FeO 6 octahedra and SO 4 tetrahedra. Batch dissolution experiments carried out on synthetic jarosite at pH 2, to mimic environments affected by ARD/AMD, and at pH 8, to simulate ARD/AMD environments recently remediated with slaked lime (Ca(OH) 2 ), suggest first order dissolution kinetics. Both dissolution reactions are incongruent as revealed by non-ideal dissolution of the parent solids and, in the case of the pH 8 dissolution, because of a secondary goethite precipitate on the surface of the dissolving jarosite grains. The pH 2 dissolution yields only aqueous K, Fe and SO 4 . Aqueous, residual solid and computational modelling of the jarosite structure and surfaces using the GULP and MARVIN codes, respectively, show for the first time that there is selective dissolution of the A-and T-sites, which contain K and SO 4 , respectively, relative to Fe, which is located deep within the T-O-T jarosite structure. These results have implications for the chemistry of ARD/AMD waters, and for understanding reaction pathways of ARD/AMD mineral dissolution.

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Section: Characterisation Of Synthetic Jarositesupporting

confidence: 89%

Section: Dissolution Experimentsmentioning

confidence: 99%

Section: Dissolution Experimentsmentioning

confidence: 99%

Section: Characterisation Of Synthetic Jarositementioning

confidence: 99%

See 2 more Smart Citations

Dissolution of jarosite [KFe3(SO4)2(OH)6] at pH 2 and 8: Insights from batch experiments and computational modelling

Smith

Hudson‐Edwards

Dubbin

et al. 2006

Geochimica et Cosmochimica Acta

129

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show abstract

“…2a-c) with those previously reported confirm that the phases synthesised are jarosite analogues and that no other phases have been detected (Baron and Palmer, 1996;Drouet and Navrotsky, 2003;Powers et al, 1975;Serna et al, 1986). The O-H stretching (v OH ) band in the region 2900 to 3700 cm -1 shifts toward lower frequencies for the synthetic Pb-As (3343 cm -1 ), Pb-Cu (3362 cm -1 ) and Pb-Zn jarosites (3357 cm -1 ), compared with end-member synthetic K-jarosite (3385 cm -1 ) (Smith et al, 2006).…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)supporting

confidence: 86%

Synthesis, characterization and thermochemistry of synthetic Pb–As, Pb–Cu and Pb–Zn jarosites

Forray

Smith

Navrotsky

et al. 2014

Geochimica et Cosmochimica Acta

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The enthalpy of formation from the elements of well characterized Pb-As, Pb-Cu, measured by high temperature oxide melt solution calorimetry and gave !Hº f = -3691.2 ± 8.6 kJ/mol, !Hº f = -3653.6 ± 8.2 kJ/mol, and !Hº f = -3669.4 ± 8.4 kJ/mol, respectively. Using estimated entropies, the standard Gibbs free energy of formation from elements at 298 K !Gº f of the three compounds were calculated to be -3164.8 ± 9.1 kJ/mol, -3131.4 ± 8.7 kJ/mol, and -3153.6 ± 8.9 kJ/mol, respectively. Based on these free energies, their logK sp values are -13.94 ± 1.89, -4.38 ± 1.81 and -3.75 ± 1.80, respectively. For tis compounds, a log 10 {Pb 2+ } -pH diagram is presented. The diagram shows that the formation of Pb-As jarosite may decrease aqueous arsenic and lead concentrations to meet drinking water standards. The new thermodynamic data confirm that transformation of Pb-As jarosite to plumbojarosite is thermodynamically possible.

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Behavior of bromide, chloride, and phosphate during low-temperature aqueous Fe(II) oxidation processes on Mars

Zhao

McLennan

Schoonen

2014

J. Geophys. Res. Planets

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Solubility of jarosite at 4–35 °C

Cited by 231 publications

References 12 publications

Dissolution of jarosite [KFe3(SO4)2(OH)6] at pH 2 and 8: Insights from batch experiments and computational modelling

Dissolution of jarosite [KFe3(SO4)2(OH)6] at pH 2 and 8: Insights from batch experiments and computational modelling

Synthesis, characterization and thermochemistry of synthetic Pb–As, Pb–Cu and Pb–Zn jarosites

Behavior of bromide, chloride, and phosphate during low-temperature aqueous Fe(II) oxidation processes on Mars

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