一种用于测量盐溶液中烃类活度系数、分配系数和溶解度的顶空法。
A Head-Space Method for Measuring Activity Coefficients, Partition Coefficients, and Solubilities of Hydrocarbons in Saline Solutions.
作者信息
Wasik Stanley P, Schwarz Frederick P, Tewari Yadu B, Miller Michele M, Purnell J H
机构信息
National Bureau of Standards, Gaithersburg, MD 20899.
University College of Swansea, Swansea, Wales, UK.
出版信息
J Res Natl Bur Stand (1977). 1984 May-Jun;89(3):273-277. doi: 10.6028/jres.089.016.
An apparatus is described which measures the equilibrium distribution of a hydrocarbon between a gas and aqueous phase. Soluble hydrocarbons are extracted from an aqueous salt solution by very small bubbles of hydrogen generated electrolytically from a gold electrode located at the bottom of a cylindrical cell. The partition coefficient is determined from the volume of the aqueous solution and the solute concentration in the head-space after a measured volume of hydrogen has bubbled through the cell. The concentration of the solute in the head-space is measured by gas chromatography. The observed distribution is supplemented by vapor pressure and molar volume data and can be used to calculate the solubility and the activity coefficient of the solute in the aqueous phase. The partition coefficient, activity coefficient, and solubility for 18 alkylbenzenes in aqueous 0.5 M NaCl at 25 °C were measured by this method.
描述了一种测量碳氢化合物在气相和水相之间平衡分布的装置。可溶性碳氢化合物通过位于圆柱形电解池底部的金电极电解产生的非常小的氢气泡，从盐水溶液中萃取出来。在测量体积的氢气鼓泡通过电解池后，根据水溶液的体积和顶部空间中溶质的浓度确定分配系数。顶部空间中溶质的浓度通过气相色谱法测量。通过蒸气压和摩尔体积数据补充观察到的分布，并可用于计算溶质在水相中的溶解度和活度系数。用该方法测量了18种烷基苯在25℃的0.5M NaCl水溶液中的分配系数、活度系数和溶解度。
Zotero 插件