Solid–Liquid Equilibria in Aqueous Solutions of Tris, Tris-NaCl, Tris-TrisHCl, and Tris-(TrisH) 2 SO 4 at Temperatures from 5 to 45 °C
Solid–Liquid Equilibria in Aqueous Solutions of Tris, Tris-NaCl, Tris-TrisHCl, and Tris-(TrisH) 2 SO 4 at Temperatures from 5 to 45 °C
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5 至 45 °C 温度下 Tris、Tris-NaCl、Tris-TrisHCl 和 Tris-(TrisH) 2 SO 4 水溶液中的固液平衡
DOI：
10.1021/acs.jced.0c00744
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发表时间：
2021
影响因子：
--
通讯作者：
Clegg, Simon L.
中科院分区：
文献类型：
--
作者：
Lodeiro, Pablo;Turner, David R.;Achterberg, Eric P.;Gregson, Florence K.;Reid, Jonathan P.;Clegg, Simon L.
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）。需要开发含有 Tris、TrisH+ 和海水主要离子的缓冲溶液的化学形态模型，以便可以计算介质成分和浓度变化对 pH 值的影响。此类形态模型中常用的皮策活度系数方程根据溶解离子和不带电溶质物质之间的相互作用描述溶液的热力学性质。为了确定其中一些相互作用，我们测量了 Tris(s) 在水和 NaCl、TrisHCl 和 (TrisH)2SO4 水溶液中的溶解度，以及 NaCl(s) 在 Tris(aq) 水溶液中的溶解度，温度范围为 5 至 45 °C。我们报告了 Tris 溶液在 293.5 K 至固体高过饱和度下水活度的测量结果。使用 Pitzer 方程，我们将结果与产生 TrisH+ 在 NaCl 水溶液中的化学计量解离常数的文献数据以及含有溶解的 Tris、TrisHCl 和 NaCl 的细胞的电动势进行比较。确定了 25 °C 下 Tris 与 TrisH+、Na+ 和 SO42– 离子相互作用的参数值。
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)2SO4and 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 SO42–at 25 °C are determined.