Mathematical equations combined with the MHE-GC method to study desorption kinetics of contaminants from food-package paper to air

作者：Huang, Chongxing^*; Zhao, Yuan; Liu, Yang; Wang, Shuangfei

来源：New Journal of Chemistry, 2017, 41(22): 13838-13845.

DOI：10.1039/c7nj02872e

• MULTIPLE HEADSPACE EXTRACTION
• GAS-CHROMATOGRAPHIC METHOD
• RECYCLED PAPERBOARD
• MINERAL-OIL
• DRY FOODS
• MASS-SPECTROMETRY
• METHANOL CONTENT
• MIGRATION
• CONTACT
• ADSORPTION

In this study, a technique based on multiple headspace extraction gas chromatography (MHE-GC) was applied to determine the transfer kinetics of contaminants from paper-based packaging materials to air because of its sensitivity and safety. Mathematical equations were derived in order to calculate the desorption reaction rate constant of a contaminant. This procedure was applied to five contaminants: o-xylene, ethanol absolute, n-dodecane, diphenyl oxide, and diallyl-o-phthalate. The results indicated that the desorption reaction rate constant increased with temperature. The vapor pressure and chemical structure of the contaminants also affected the desorption reaction rate constant. Temperature had a predominant effect on the desorbing kinetics of the contaminants. The equilibrium times of desorption decreased as the temperature increased; for example, the equilibrium times of o-xylene were >= 4, 4, and 1 h at 40, 70, and 100 degrees C, respectively.

• 出版日期2017-11-21
• 单位广西大学