最大泡压法测表面张力等温线的数据处理方法比较*

对乙酸、丙酸、正丁酸、2-甲基丁酸、3-甲基丁酸、正戊酸、正己酸、乙醇、丙醇、异丙醇、正丁醇、异丁醇、1,2-丙二醇等13种常用试剂在25 ℃下的表面张力数据拟合方法进行了比较,分析了图解法处理数据及多项式、一阶指数函数、幂函数、Shishkovsky经验公式拟合数据的优缺点。指出Shishkovsky经验公式拟合结果准确,受数据样本量影响小,是理想的表面张力数据拟合方法。

Comparison of Data Processing Methods in Bubble-Pressure Method for Measuring Surface Tension of Solutions

The surface tension data fitting methods of 13 substances such as acetic acid,propionic acid,n-butyric acid,2-methyl butyric acid,3-methyl butyric acid,valeric acid,hexanoic acid,ethanol,propyl alcohol,isopropyl alcohol,1-butanol,2-methyl-1-propanol,1,2-propanediol at 25℃were compared.The advantages and disadvantages of graphic method,polynomial approximation,first-order exponential function,power function and Shishkovsky formula were analyzed.It is pointed out that Shishkovsky formula is an ideal fitting method for surface tension data for its accurate fitting results with less affected by the sample size of data.