Determination of Gas-Liquid Equilibrium Phase Diagram of Binary Liquid System by ATR-FTIR Spectroscopy
SHANG Yan-Li1, WANG Qing-Xin1, WANG Yao1, FU Jie1, HUO Shu-Ying1, RUN Ming-Tao1,2, MA Gang1,3**
1. College of Chemistry and Materials Science,Hebei University,Baoding 071002,China; 2. National Demonstration Center for Experimental Chemistry Education,Hebei University,Baoding 071002,China; 3. Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Hebei University, Baoding 071002,China
Abstract In current physical chemistry laboratory textbooks,the classic refractive index method is commonly used for quantitative determination of gas and liquid phase composition in the experiment of“Gas-Liquid Equilibrium Phase Diagram of a Binary Liquid System”.This work innovatively introduces infrared spectroscopy to quantitatively determine the composition of gas and liquid phases.By utilizing attenuated total reflection Fourier transform infrared(ATR-FTIR)spectroscopy technology,combined with a home-designed infrared liquid cell,and selecting suitable infrared characteristic absorption peak of the binary liquid system,a linear relationship between the absorbance of characteristic infrared peak and the composition of the solution is established,successfully enabling infrared quantitative analysis of gas and liquid phase solution compositions,which is then used to construct the phase diagram.This teaching innovation,while maintaining the classical content of the laboratory course,introduces modern spectroscopic technology,making physical chemistry laboratory course teaching more in line with the requirements of the new era.
SHANG Yan-Li, WANG Qing-Xin, WANG Yao, FU Jie, HUO Shu-Ying, RUN Ming-Tao, MA Gang. Determination of Gas-Liquid Equilibrium Phase Diagram of Binary Liquid System by ATR-FTIR Spectroscopy[J]. Chinese Journal of Chemical Education, 2025, 46(16): 70-75.
