High dilution calorimetric determination of the standard state thermodynamic differences between the properties of H+(aq) and Na+(aq) up to 598.15K

Djamali, Essmaiil; Cobble, J. W.

doi:10.1016/j.jct.2009.06.004

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Djamali et al 10,11 studied the thermodynamics of aqueous sodium perrhenate and its acid analog up to 325 °C. In the course of their measurements, they observed a black precipitate, reported to be rhenium oxide, ReO 2 (cr), which formed according to an unspecified decomposition reaction: …”

Section: Thermal Decomposition Productsmentioning

confidence: 99%

“…In the aqueous (aq) phase, these internal reference standards must be soluble, non-complexing, and thermally stable under the conditions of interest. The species that have been used for this purpose in thermochemical and transport property measurements, and in Raman studies with macro-scale cells, are the non-complexing anions perchlorate (ClO 4 ), 4,8,9 perrhenate (ReO- 4 ), 10,11 and trifluoromethanesulfonate, or “triflate” (CF 3 SO 4 ). 12,–15 CF 3 SO 4 has been used as a non-oxidizing alternative to CIO 4 since first identified for this purpose by Fabes and Swaddle.…”

Section: Introductionmentioning

confidence: 99%

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Non-Complexing Anions for Quantitative Speciation Studies Using Raman Spectroscopy in Fused Silica High-Pressure Optical Cells under Hydrothermal Conditions

et al. 2015

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This paper reports methods for obtaining time-dependent reduced isotropic Raman spectra of aqueous species in quartz capillary high-pressure optical cells under hydrothermal conditions, as a means of determining quantitative speciation in hydrothermal fluids. The methods have been used to determine relative Raman scattering coefficients and to examine the thermal decomposition kinetics of the non-complexing anions bisulfate (HSO4(-)), perchlorate (CIO4(-)), perrhenate (ReO4(-)), and trifluoromethanesulfonate, or "triflate" (CF3SO3(-)) in acidic and neutral solutions at temperatures up to 400°C and 30 MPa. Arrhenius expressions for calculating the thermal decomposition rate constants are also reported. Thermal stabilities in the acidic solutions followed the order HSO4(-) (stable) > ReO4(-) > CIO4(-) > CF3SO3(-), with half-lives (t1/2) > 7 h at 300°C. In neutral solutions, the order was HSO4(-) (stable) > CF3SO3(-) > ReO4(-) > CIO4(-), with t1/2 > 8 h at 350°C. CF3SO3(-) was extremely stable in neutral solutions, with t1/2 > 11 h at 400°C.

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Section: Thermal Decomposition Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-Complexing Anions for Quantitative Speciation Studies Using Raman Spectroscopy in Fused Silica High-Pressure Optical Cells under Hydrothermal Conditions

et al. 2015

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A high-temperature high-pressure calorimeter for determining heats of solution up to 623 K

Djamali

Turner

Murray

et al. 2010

Review of Scientific Instruments

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A high-temperature high-pressure isoperibol calorimeter for determining the heats of solution and reaction of very dilute substances in water (10(-4) m) at temperatures up to 623 K is described. The energies of vaporization of water at steam saturation pressure were measured as a function of temperature and the results agree with the corresponding values from steam tables to better than 0.08+/-0.18%. The novelties of the present instrument relative to flow type heat capacity calorimeters are that measurements can be made at orders of magnitude lower concentrations and that measurement of heat of reaction involving solids or gases or in the presence of high concentrations of supporting electrolytes, acids, and bases is possible. Furthermore, the advantage of using enthalpy data over heat capacity data for calculations of the standard state Gibbs free energies of electrolytes is that the experimental heat data of this research need only be integrated once to derive higher temperature free energy data from lower temperatures. The derived heat capacities can be used mathematically to obtain free energies by double integration. However, the resulting errors are much smaller than if experimental aqueous heat capacities were used for the integrations.

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Solution Calorimetry Under Hydrothermal Conditions

Tremaine¹,

Arcis²

2013

Reviews in Mineralogy and Geochemistry

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High dilution calorimetric determination of the standard state thermodynamic differences between the properties of H+(aq) and Na+(aq) up to 598.15K

Cited by 3 publications

References 18 publications

Non-Complexing Anions for Quantitative Speciation Studies Using Raman Spectroscopy in Fused Silica High-Pressure Optical Cells under Hydrothermal Conditions

Non-Complexing Anions for Quantitative Speciation Studies Using Raman Spectroscopy in Fused Silica High-Pressure Optical Cells under Hydrothermal Conditions

A high-temperature high-pressure calorimeter for determining heats of solution up to 623 K

Solution Calorimetry Under Hydrothermal Conditions

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