Activity Coefficients of HCl in Solutions Related to “Tris” Buffers in Artificial Seawater. II. HCl + NaCl + TrisHCl + H2O, and Tris Buffer + NaCl + H2O, to High Ionic Strength and from 5 to 40 °C

IF 2.1 3区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY
Igor Maksimov*, Toshiaki Asakai, Yuya Hibino and Simon L. Clegg*, 
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引用次数: 0

Abstract

The substance Tris (2-amino-2-hydroxymethyl-1,3-propanediol, CAS 77-86-1), and its protonated form TrisH+, are used in the preparation of ‘total’ pH buffers in artificial seawater media. The development of a chemical speciation model of the buffer solutions, using the Pitzer equations to calculate solute activity coefficients, is desirable in order to quantify the effects of composition change, convert the total pH to other scales, and address metrological requirements for traceability to the International System of Units. Here, in the second of a series of studies, we present Harned cell measurements of potentials and mean activity coefficients of HCl in solutions containing HCl, NaCl, and TrisHCl for ionic strengths from 1.0 to 5.5 mol kg–1 and from 5 to 40 °C. The results at 25 °C are consistent with those of the literature studies of the two end-member solutions (aqueous HCl + NaCl, and HCl + TrisHCl). We also present results of measurements of buffer solutions containing equimolal Tris and TrisHCl (hence TrisH+), and NaCl, at ionic strengths of 0.2, 1.0, and 4.0 mol kg–1 at the same temperatures. These are compared with literature data for Tris buffers in an artificial seawater medium. Aspects of the development of a Pitzer model for these solutions are discussed.

人工海水中与“Tris”缓冲液相关溶液中HCl的活度系数2。HCl + NaCl + TrisHCl + H2O和Tris Buffer + NaCl + H2O,在5 ~ 40°C范围内达到高离子强度
物质Tris(2-氨基-2-羟甲基-1,3-丙二醇,CAS 77-86-1)及其质子化形式TrisH+用于制备人工海水介质中的“总”pH缓冲液。开发缓冲溶液的化学形态模型,使用Pitzer方程来计算溶质活度系数,是可取的,以便量化组成变化的影响,将总pH值转换为其他刻度,并解决可追溯国际单位制的计量要求。这里,在系列研究的第二部分,我们展示了HCl在含有HCl、NaCl和TrisHCl的溶液中,在离子强度从1.0到5.5 mol kg-1和5到40°C范围内的电位和平均活度系数的哈内德细胞测量。在25°C下的结果与文献中对两端元溶液(水溶液HCl + NaCl和HCl + TrisHCl)的研究结果一致。我们还介绍了在相同温度下,在离子强度为0.2、1.0和4.0 mol kg-1时,含有等摩尔Tris和TrisHCl(因此是TrisH+)和NaCl的缓冲溶液的测量结果。这些数据与人工海水介质中Tris缓冲液的文献数据进行了比较。讨论了为这些解决方案开发Pitzer模型的各个方面。
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来源期刊
Journal of Chemical & Engineering Data
Journal of Chemical & Engineering Data 工程技术-工程:化工
CiteScore
5.20
自引率
19.20%
发文量
324
审稿时长
2.2 months
期刊介绍: The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.
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