物理化学学报 >> 2008, Vol. 24 >> Issue (04): 705-708.doi: 10.3866/PKU.WHXB20080428

研究简报 上一篇    下一篇

质子转移反应质谱动态测量苯系物的亨利常数

李建权; 沈成银; 王鸿梅; 韩海燕; 郑培超; 徐国华; 江海河; 储焰南   

  1. 中国科学院安徽光学精密机械研究所环境光谱学实验室, 合肥 230031; 中国科学院环境光学与技术重点实验室, 合肥 230031
  • 收稿日期:2007-10-17 修回日期:2007-12-14 发布日期:2008-04-07
  • 通讯作者: 储焰南 E-mail:ychu@aiofm.ac.cn

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 E-mail:ychu@aiofm.ac.cn

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摘要： 采用动态气体提取方法, 使用自行研制的质子转移反应质谱(PTR-MS)装置, 研究了挥发性苯系物亨利常数的测量方法. 考察了苯在提取气体与水溶液中达到平衡需要的液面高度, 通过25 ℃条件下苯的亨利常数测量验证了动态气体提取方法结合质子转移反应质谱测量亨利常数的有效性, 报告了11种苯系物的亨利常数测量结果. 与常规的亨利常数测量方法相比, 本方法具有简单、快速、人为干扰少等优点.

关键词: 亨利常数, 质子转移反应质谱, 化学电离, 挥发性有机物, 在线监测

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