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<p>This study allowed us to establish a procedure for determining the <i>pH</i> of seawater by the primary method using cell without junction (Harned cell) in artificial seawater without sulfate ASW-SO<sub>4</sub> which is taken as a reference buffer solution featuring the natural seawater at salinity 35 and an ionic strength equal to <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({0.6731\text{ mol kg}}^{-1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>0.6731</mn> <mspace width="0.333333em" /> <mtext>mol kg</mtext> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> </math></EquationSource> </InlineEquation>. The determination of the coefficient average activity (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\gamma \pm HCl\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>γ</mi> <mo>±</mo> <mi>H</mi> <mi>C</mi> <mi>l</mi> </mrow> </math></EquationSource> </InlineEquation>) of HCl was taken from two approaches. The first one is an experimental approach in which we introduced the potential standard value (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(E^\circ \)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>E</mi> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation>) calculated in dilute media. In the second approach, we applied and adapted the Pitzer model in function of the temperature (15, 25 and 35&#xa0;°C) taking into account all the parameters of the solution in ionic interactions and we demonstrated its feasibility for the solution ASW-SO<sub>4</sub>. The choice was made for the first option which was preferred because of its simpler implementation.</p>

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Toward a primary measurement procedure for pH in seawater: comparison of mean activity coefficients in saline aqueous matrices

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Mounir Ben Achour,
  • Fatma Guesmi,
  • Ikhlass Marzouk,
  • Chiraz Hannachi

摘要

This study allowed us to establish a procedure for determining the pH of seawater by the primary method using cell without junction (Harned cell) in artificial seawater without sulfate ASW-SO4 which is taken as a reference buffer solution featuring the natural seawater at salinity 35 and an ionic strength equal to \({0.6731\text{ mol kg}}^{-1}\) 0.6731 mol kg - 1 . The determination of the coefficient average activity ( \(\gamma \pm HCl\) γ ± H C l ) of HCl was taken from two approaches. The first one is an experimental approach in which we introduced the potential standard value ( \(E^\circ \) E ∘ ) calculated in dilute media. In the second approach, we applied and adapted the Pitzer model in function of the temperature (15, 25 and 35 °C) taking into account all the parameters of the solution in ionic interactions and we demonstrated its feasibility for the solution ASW-SO4. The choice was made for the first option which was preferred because of its simpler implementation.