Tris，Tris-NaCl，Tris-TrisHCl和Tris-（TrisH）<sub>2</sub> SO <sub>4</sub>水溶液在5至45°C温度下的固液平衡,Journal of Chemical & Engineering Data

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Tris，Tris-NaCl，Tris-TrisHCl和Tris-（TrisH）₂ SO ₄水溶液在5至45°C温度下的固液平衡
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-12-14 , DOI: 10.1021/acs.jced.0c00744
Pablo Lodeiro ₁ , David R. Turner ₂ , Eric P. Achterberg ₁ , Florence K. A. Gregson ₃ , Jonathan P. Reid ₃ , Simon L. Clegg ₄

Affiliation

Tris（或THAM，2-氨基-2-羟甲基-1,3-丙二醇）物质用于制备pH缓冲溶液，用于天然水化学，包括海水。建立含Tris，TrisH ⁺和海水主要离子的缓冲溶液的化学形态模型是可取的，这样就可以计算出培养基组成和浓度变化对pH的影响。通常在此类形态模型中使用的Pitzer活度系数方程式根据溶解离子与不带电溶质物种之间的相互作用来描述溶液的热力学性质。为了确定一些这些相互作用的，我们已经测量的Tris溶解度_（S）在水和NaCl的水溶液，的TrisHCl，和（TRISH）₂ SO ₄和NaCl的溶解度_（S）在水Tris _{（水溶液）}，5至45℃。我们报告了Tris溶液在293.5 K到相对于固体的高过饱和度的水活度的测量结果。使用Pitzer方程，我们将我们的结果与文献数据进行比较，得出在NaCl水溶液中TrisH ^+的化学计量解离常数，并与含有溶解的Tris，TrisHCl和NaCl的细胞的电动势进行比较。确定了在25°C下Tris与离子TrisH ⁺，Na ⁺和SO ₄^2–相互作用的参数值。

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Solid–Liquid Equilibria in Aqueous Solutions of Tris, Tris-NaCl, Tris-TrisHCl, and Tris-(TrisH)2SO4 at Temperatures from 5 to 45 °C

The substance Tris (or THAM, 2-amino-2-hydroxymethyl-1,3-propanediol) is used in the preparation of pH buffer solutions for applications in natural water chemistry, including seawater. The development of a chemical speciation model of buffer solutions containing Tris, TrisH⁺, and the major ions of seawater is desirable, so that the effects of changes in the composition and concentration of the medium on pH can be calculated. The Pitzer activity coefficient equations, commonly used in such speciation models, describe the thermodynamic properties of solutions in terms of interactions between dissolved ions and uncharged solute species. To determine some of these interactions, we have measured solubilities of Tris_(s) in water and aqueous solutions of NaCl, TrisHCl, and (TrisH)₂SO₄ and the solubility of NaCl_(s) in aqueous Tris_(aq), from 5 to 45 °C. We report measurements of the water activities of Tris solutions at 293.5 K to high supersaturation with respect to the solid. Using the Pitzer equations, we compare our results to literature data yielding stoichiometric dissociation constants of TrisH⁺ in aqueous NaCl, and to electromotive forces of cells containing dissolved Tris, TrisHCl, and NaCl. Values of parameters for the interactions of Tris with the ions TrisH⁺, Na⁺, and SO₄^2– at 25 °C are determined.

更新日期：2021-01-14

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