Aqueous speciation of arsenic in sulfuric acid and cupric sulfate solutions

Casas, J. Manuel; Etchart, J. P.; Cifuentes, Luis Fernández

doi:10.1002/aic.690490827

Cited by 14 publications

(24 citation statements)

References 23 publications

(11 reference statements)

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“…At each composition the reaction rates calculated from eqn (40) are two to three times larger than the corresponding rates suggested by eqn (15). To examine the effects of increased Roebuck reaction rates on front propagation, simulations were repeated using Pendlebury and Smith's eqn (40) for r B , instead of eqn (15). The revised Roebuck reaction rates increase the predicted front velocities by about 10%, as shown in Fig.…”

Section: Tests Of the Accuracy Of The Front Simulationsmentioning

confidence: 97%

“…The recommended values of rate constants 35 f, g and h are listed in Table 2. Table 4 gives for comparison Roebuck reaction rates for typical front compositions calculated from eqn ( 15) and (40). At each composition the reaction rates calculated from eqn (40) are two to three times larger than the corresponding rates suggested by eqn (15).…”

Section: Tests Of the Accuracy Of The Front Simulationsmentioning

confidence: 97%

“…The second and third dissociations of arsenic acid (pK 2a 7.1 and pK 3a 9.2) 47 can also be safely neglected. In addition to the species involved in the Dushman and Roebuck reactions, however, the equilibria [29][30][31][40][41][42][43]…”

Section: Nernst-planck Analysis Of Iodate-arsenous Acid Frontsmentioning

confidence: 99%

“…The quantitative description of iodate-arsenous acid front propagation developed in this paper includes the diffusion potential and the fluxes of all of the species involved in reactions ( 1) and ( 2). The treatment includes the additional fluxes of I 3 À , H 2 AsO 4 À and molecular HIO 3 produced by the association-dissociation equilibria 29,30,[40][41][42][43] . Fixed pH and steady front velocities are not assumed, and accurate diffusion coefficients are used for each solution species.…”

Section: Introductionmentioning

confidence: 99%

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Nernst–Planck analysis of propagating reaction-diffusion fronts in the aqueous iodate–arsenous acid system

Mercer

Banks

Leaist

2007

Phys. Chem. Chem. Phys.

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Propagating fronts can be generated in solution by combining diffusion and chemical reactions with an autocatalytic feedback mechanism. Front propagation is usually analyzed in terms of the rate equations for the chemical reactions and Fick's laws of molecular diffusion. In practice, however, reaction-diffusion fronts are known mainly for aqueous electrolyte solutions. A more accurate description of front propagation in these systems is developed by using Nernst-Planck (NP) transport equations. This treatment includes diffusion fluxes driven by the concentration gradients and, for the ionic species, the migration fluxes driven by the electric field which is generated internally by the diffusion of ions of different mobility. NP equations are used to describe propagating fronts for the iodate oxidation of aqueous arsenous acid. The analysis provides a detailed picture of front structure and propagation, including concentration profiles, reaction rate profiles and velocity profiles for the solution species. After a short induction period, fully-developed fronts reach steady velocities and the profiles across the fronts transformed from laboratory coordinates to the frame of reference moving with the front become time-independent. The velocities of the autocatalytic I(-) ions ahead of the fronts are nearly identical to the steady front velocities. Electric fields generated by ionic diffusion across the fronts reach maximum strengths of about 0.4 V cm(-1), producing ion migration velocities as large as 50% of the front velocities.

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Section: Tests Of the Accuracy Of The Front Simulationsmentioning

confidence: 97%

Section: Tests Of the Accuracy Of The Front Simulationsmentioning

confidence: 97%

Section: Nernst-planck Analysis Of Iodate-arsenous Acid Frontsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nernst–Planck analysis of propagating reaction-diffusion fronts in the aqueous iodate–arsenous acid system

Mercer

Banks

Leaist

2007

Phys. Chem. Chem. Phys.

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“…Bisulfate is a type of acidic salt related to human industrial activity. Salt solutions have important effects on the chemical production and corrosion of metals, 1 copper hydrometallurgical processes, 2 organic matter, 3 and geochemistry. 4,5 Early studies primarily focused on the physicochemical properties of hydrogen sulfate solutions, the second ionization constant of H 2 SO 4 (aq), 6 and the thermodynamic analysis of H 2 SO 4 .…”

Section: Introductionmentioning

confidence: 99%

A Direct Quantitative Raman Method for the Measurement of Dissolved Bisulfate in Acid-Sulfate Fluids

et al. 2018

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Raman spectroscopy has been applied to the quantitative analysis of the concentration of bisulfate in acid-sulfate fluids at different temperatures. The quantitative analysis method is based on the peak area ratios of [Formula: see text](ν) and HO (ν), where PA([Formula: see text]/HO) = [[Formula: see text]] × (0.0066 × T + 1.3070) at a temperature range of 0-100 ℃. We found that the molal scattering coefficient of bisulfate increases slightly at the elevated temperature may be due to the changes of fraction of water molecules that are hydrogen-bonded. The method can also be applied to analyze physicochemical parameters of other acid fluids, such as hydrogen phosphate, bicarbonate, etc., and especially to the in situ detection of deep sea acid-sulfate hydrothermal fluids in the future.

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Thermodynamic Modeling of Iron-Copper-Sulfuric Acid Solutions During Solvent Extraction and Electrowinning for Copper Production

Yue

2021

The Minerals, Metals &Amp; Materials Series

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Aqueous speciation of arsenic in sulfuric acid and cupric sulfate solutions

Cited by 14 publications

References 23 publications

Nernst–Planck analysis of propagating reaction-diffusion fronts in the aqueous iodate–arsenous acid system

Nernst–Planck analysis of propagating reaction-diffusion fronts in the aqueous iodate–arsenous acid system

A Direct Quantitative Raman Method for the Measurement of Dissolved Bisulfate in Acid-Sulfate Fluids

Thermodynamic Modeling of Iron-Copper-Sulfuric Acid Solutions During Solvent Extraction and Electrowinning for Copper Production

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