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Effect of Amines on the Surface Charge Properties of Iron Oxides

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Abstract

Specific studies detailing the effects of amines, used as pH control agents for corrosion inhibition in power plants, on the surface charge of iron oxides provide data to assess the mechanism of how these amines impact deposition rate. The current study was undertaken in order to determine accurately the dissociation constants of the relevant amines at Pressurized Water Reactor (PWR) operating conditions and to investigate the effect of sorption of two of these amines (morpholine and dimethylamine) by magnetite. The acid-dissociation equilibria of morpholine (MOR), dimethylamine (DMA) and ethanolamine (ETA) were measured potentiometrically with a hydrogen-electrode concentration cell (HECC) from 0 to 290 °C in sodium trifluoromethanesulfonate (NaTr) solutions at ionic strengths up to 1 mol⋅kg−1. Magnetite surface titrations were performed at an ionic strength of 0.03 mol⋅kg−1 (NaTr medium) in the presence or absence of morpholine and dimethylamine buffers over a wide range of pH and total amine concentrations at 150–250 °C.

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Authors and Affiliations

  1. Université de Toulouse, UPS (OMP), LMTG, 14 Avenue Edouard Belin, 31400, Toulouse, France

    Pascale Bénézeth

  2. CNRS, LMTG, 31400, Toulouse, France

    Pascale Bénézeth

  3. IRD, LMTG, 31400, Toulouse, France

    Pascale Bénézeth

  4. Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831-6110, USA

    David J. Wesolowski

  5. Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831-6110, USA

    Donald A. Palmer

  6. Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL, 61820-7495, USA

    Michael L. Machesky

Authors
  1. Pascale Bénézeth
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  2. David J. Wesolowski
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  3. Donald A. Palmer
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  4. Michael L. Machesky
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Correspondence to Pascale Bénézeth.

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D.A. Palmer is retired.

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Bénézeth, P., Wesolowski, D.J., Palmer, D.A. et al. Effect of Amines on the Surface Charge Properties of Iron Oxides. J Solution Chem 38, 925–945 (2009). https://doi.org/10.1007/s10953-009-9419-y

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  • DOI: https://doi.org/10.1007/s10953-009-9419-y

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