Effect of nickel sulphate and magnesium sulphate on pH of sulphuric acid solutions at elevated temperatures

Z. Jankovic; V. G. Papangelakis; S. N. Lvov

doi:10.1007/s10800-008-9719-8

Effect of nickel sulphate and magnesium sulphate on pH of sulphuric acid solutions at elevated temperatures

Z. Jankovic, V. G. Papangelakis, S. N. Lvov

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

A flow-through potentiometric technique utilizing an yttria-stabilized zirconia (YSZ) pH sensor has been employed to elucidate the effects of NiSO ₄ and MgSO₄ on pH of H₂SO₄ solutions at temperatures of 200 °C and 250 °C. Solution pH was found to increase with increasing NiSO₄ and MgSO₄ concentrations at both temperatures. This trend is attributed to the dissociation of NiSO₄ and MgSO₄ where the SO₄ ^2-(aq) released reacts with H⁺(aq) to form HSO₄ ^-(aq). The conversion of measured potentials into pH values was based on the mixed-solvent electrolyte (MSE) model, which is a speciation model of the new OLI Systems^® software. Both the Henderson equation and exact definition of the diffusion potential were employed in treating the obtained experimental data. Experimental pH values calculated using the diffusion potentials evaluated by either approach are similar, suggesting that the Henderson equation can be effectively used. In addition, LiCl was found to be a suitable alternative to NaCl as the reference electrode solution.

Original language	English (US)
Pages (from-to)	751-759
Number of pages	9
Journal	Journal of Applied Electrochemistry
Volume	39
Issue number	6
DOIs	https://doi.org/10.1007/s10800-008-9719-8
State	Published - Jun 2009

All Science Journal Classification (ASJC) codes

General Chemical Engineering
Electrochemistry
Materials Chemistry

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title = "Effect of nickel sulphate and magnesium sulphate on pH of sulphuric acid solutions at elevated temperatures",

abstract = "A flow-through potentiometric technique utilizing an yttria-stabilized zirconia (YSZ) pH sensor has been employed to elucidate the effects of NiSO 4 and MgSO4 on pH of H2SO4 solutions at temperatures of 200 °C and 250 °C. Solution pH was found to increase with increasing NiSO4 and MgSO4 concentrations at both temperatures. This trend is attributed to the dissociation of NiSO4 and MgSO4 where the SO4 2-(aq) released reacts with H+(aq) to form HSO4 -(aq). The conversion of measured potentials into pH values was based on the mixed-solvent electrolyte (MSE) model, which is a speciation model of the new OLI Systems{\textregistered} software. Both the Henderson equation and exact definition of the diffusion potential were employed in treating the obtained experimental data. Experimental pH values calculated using the diffusion potentials evaluated by either approach are similar, suggesting that the Henderson equation can be effectively used. In addition, LiCl was found to be a suitable alternative to NaCl as the reference electrode solution.",

author = "Z. Jankovic and Papangelakis, {V. G.} and Lvov, {S. N.}",

note = "Funding Information: Acknowledgments We would like to acknowledge the financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC). We are grateful to Dr. Haixia Liu for providing speciation calculations. We would also like to thank Dr. David Wesolowski, Prof. William Seyfried, Jr., and Prof. Kwadwo Osseo-Asare for providing reviews of an earlier version of this paper. Copyright: Copyright 2009 Elsevier B.V., All rights reserved.",

year = "2009",

month = jun,

doi = "10.1007/s10800-008-9719-8",

language = "English (US)",

volume = "39",

pages = "751--759",

journal = "Journal of Applied Electrochemistry",

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AU - Papangelakis, V. G.

AU - Lvov, S. N.

N1 - Funding Information: Acknowledgments We would like to acknowledge the financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC). We are grateful to Dr. Haixia Liu for providing speciation calculations. We would also like to thank Dr. David Wesolowski, Prof. William Seyfried, Jr., and Prof. Kwadwo Osseo-Asare for providing reviews of an earlier version of this paper. Copyright: Copyright 2009 Elsevier B.V., All rights reserved.

PY - 2009/6

Y1 - 2009/6

N2 - A flow-through potentiometric technique utilizing an yttria-stabilized zirconia (YSZ) pH sensor has been employed to elucidate the effects of NiSO 4 and MgSO4 on pH of H2SO4 solutions at temperatures of 200 °C and 250 °C. Solution pH was found to increase with increasing NiSO4 and MgSO4 concentrations at both temperatures. This trend is attributed to the dissociation of NiSO4 and MgSO4 where the SO4 2-(aq) released reacts with H+(aq) to form HSO4 -(aq). The conversion of measured potentials into pH values was based on the mixed-solvent electrolyte (MSE) model, which is a speciation model of the new OLI Systems® software. Both the Henderson equation and exact definition of the diffusion potential were employed in treating the obtained experimental data. Experimental pH values calculated using the diffusion potentials evaluated by either approach are similar, suggesting that the Henderson equation can be effectively used. In addition, LiCl was found to be a suitable alternative to NaCl as the reference electrode solution.

AB - A flow-through potentiometric technique utilizing an yttria-stabilized zirconia (YSZ) pH sensor has been employed to elucidate the effects of NiSO 4 and MgSO4 on pH of H2SO4 solutions at temperatures of 200 °C and 250 °C. Solution pH was found to increase with increasing NiSO4 and MgSO4 concentrations at both temperatures. This trend is attributed to the dissociation of NiSO4 and MgSO4 where the SO4 2-(aq) released reacts with H+(aq) to form HSO4 -(aq). The conversion of measured potentials into pH values was based on the mixed-solvent electrolyte (MSE) model, which is a speciation model of the new OLI Systems® software. Both the Henderson equation and exact definition of the diffusion potential were employed in treating the obtained experimental data. Experimental pH values calculated using the diffusion potentials evaluated by either approach are similar, suggesting that the Henderson equation can be effectively used. In addition, LiCl was found to be a suitable alternative to NaCl as the reference electrode solution.

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Effect of nickel sulphate and magnesium sulphate on pH of sulphuric acid solutions at elevated temperatures

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