Determination of ethanol concentration of ethanol/water mixture solutions with open ended coaxial method
Determination of ethanol concentration of ethanol/water mixture solutions with open ended coaxial method
复制标题
DOI：
10.1109/icaees.2016.7888127
复制
发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
N. Khalid;M. Zainuddin;Z. Abbas;Tity Nazleen Mohamed;N. Sabli
中科院分区：
文献类型：
--
作者：
N. Khalid;M. Zainuddin;Z. Abbas;Tity Nazleen Mohamed;N. Sabli
本文提出了一种简单的、非破坏性的方法，在环境温度下基于HP 85070 B开放式同轴介电常数测量仪测定乙醇/水溶液中的乙醇浓度。本研究的动机源于这样一个事实，即由于乙醇的吸湿性、蒸发和其他因素，“标记”容器中乙醇的“真实”浓度可能“被破坏”。用改进的Cole-Cole-Debye（3CC）模拟方法对8种不同摩尔分数的样品的介电常数测量结果进行了验证。基于3CC模拟开发了一个五次多项式校准方程，R2 = 0.9998，并用于估计从实验室保存的“标记”容器中获得的三种乙醇样品的“真实”浓度。发现其中两个样品的乙醇浓度远低于其标签上所示的浓度，因此认为已变质。
This study presents a simple and non-destructive procedure to determine ethanol concentration of ethanol/water solution at ambient temperature based on HP85070B open ended coaxial dielectric constant measurement. The motivation for this study stems from the fact that the ‘true’ concentration of ethanol in a ‘labeled’ container could be ‘spoiled’ due to hygroscopic nature of ethanol, evaporation and other factors. The dielectric constant measurements of eight samples with different molar fraction were validated with modified Cole-Cole-Debye (3CC) simulations. A 5th degree polynomial calibration equation was developed based on 3CC simulations with R2 = 0.9998 and used to estimate the ‘true’ concentration of three ethanol samples obtained from ‘labeled’ containers kept in laboratory. The ethanol concentrations of two of the samples were found to be much lower than what was indicated on their labels, hence, assumed spoiled.