Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (04): 705-708.doi: 10.3866/PKU.WHXB20080428

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Dynamic Measurements of Henry’s LawConstant of Aromatic Compounds Using Proton Transfer Reaction Mass Spectrometry

LI Jian-Quan; SHEN Cheng-Yin; WANG Hong-Mei; HAN Hai-Yan; ZHENG Pei-Chao; XU Guo-Hua JIANG Hai-He; CHU Yan-Nan   

  1. Laboratory of Environment Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, P. R. China; Key Laboratory of Environmental Optics & Technology, Chinese Academy of Sciences, Hefei 230031, P. R. China
  • Received:2007-10-17 Revised:2007-12-14 Published:2008-04-07
  • Contact: CHU Yan-Nan

Abstract: Henry’s lawconstants (HLC) of volatile aromatic compounds were determined using a dynamics approach by coupling a stripping cell directly to a homemade proton transfer reaction mass spectrometry (PTR-MS). The intensity of C6H6H+ ion dependence on liquid height of benzene solution was explored in order to ensure the equilibrium of aromatic compound components between the gas-bubbles and water. The HLC of benzene measured at 25 ℃ is in agreement with the reported value in literature, showing that this method is valid. HLC values were presented for benzene, toluene, ethylbenzene, chlorobenzene, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, 1,2-dimethylbenzene, 1,3-dimethylbenzene, 1,4-dimethylbenzene, and 1,2,4-trimethylbenzene. Compared to the conventional techniques, the dynamics extraction combination with PTR-MS is simple, fast, and less prone to artifacts in the HLC measurement.

Key words: Henry’s law constant, Proton transfer reaction mass spectrometry, Chemical ionization, Volatile organic compounds, On-line monitoring


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