Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (5): 852-854.DOI: 10.19894/j.issn.1000-0518.210175

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Effect of Dimethyl Sulfoxide on the Retention Time of Acetic Acid in Gas Chromatography and Its Mechanism

Ren MU1(), Shun NA2, Natsagdorj NARANTSOGT1, Chong-Jiu LI3   

  1. 1.Department of Chemistry School of Mathematic and Natural Science Mongolian National University of Education,Ulaanbaatar 210648,Mongolia
    2.Agilent Technologies China Co. ,Ltd. ,Beijing 100102,China
    3.China Agricultural University College of Science,Beijing 100193,China
  • Received:2021-04-07 Accepted:2021-08-12 Published:2022-05-01 Online:2022-05-24
  • Contact: Ren MU
  • About author:muren117@gmail.com

Abstract:

The mechanism for the fluctuation of the retention time of acetic acid dissolved in dimethyl sulfoxide (DMSO) was explored through gas chromatography, infrared spectroscopy, and quantum chemical calculations. Our results indicate that the change in retention time of acetic acid is linearly related to the increase of the volume of DMSO (R2=0.99301). Infrared spectroscopy analysis shows that a hydrogen bond is formed between DMSO and acetic acid, which passes through the column in the form of DMSO-acetic acid molecules. According to the calculation results of the Gaussian09 program, the high electron density portion of DMSO gives electrons and forms a hydrogen bond with acetic acid, while the portion with the low electron density can easily obtain electrons and form bonds with polyethylene glycol, a column stationary phase with a strong dipole moment, and then adsorb on the fixed liquid. Therefore, under the combined influence of this series of complex intermolecular forces, the retention time of acetic acid fluctuates, and the retention time of acetic acid increases together with the volume ratio of the DMSO solvent.

Key words: Gas chromatography, Retention time, Dimethyl sulfoxide, Acetic acid, Hydrogen bond

CLC Number: