Quantification of Volatile Compounds in the Headspace of Aqueous Liguids Using Selected Ion Flow Tube Mass Spectrometry

0181504 - UFCH-W 20020242 RIV GB eng J - Journal Article
Španěl, Patrik - Diskin, A. M. - Abbott, S. M. - Wang, T. - Smith, D.
Quantification of Volatile Compounds in the Headspace of Aqueous Liguids Using Selected Ion Flow Tube Mass Spectrometry.
Rapid Communications in Mass Spectrometry. Roč. 16, - (2002), s. 2148-2153. ISSN 0951-4198. E-ISSN 1097-0231
R&D Projects: GA ČR GA203/00/0632; GA ČR GA203/02/0737
Institutional research plan: CEZ:AV0Z4040901
Keywords : mass spectrometry * SIFT-MS
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.372, year: 2002

We describe a method by which the concentrations of volatile compounds in the headspace of their dilute aqueous solutions in sealed containers can be determined using on-line selected ion flow tube mass spectrometry, SIFT-MS. Thus, the changing number density of the molecules of the volatile compound in the carrier gas of the SIFT-MS instrument is described in terms of its changing flow rate as the pressure in the sealed container decreases during the sampling procedure. It is shown that the best analytical procedure is to determine the mean concentration of the trace gas in the liquid headspace over a given sampling time and relate this to the required concentration, which is the initial equilibrium concentration established before the pressure in the sealed container reduces significantly. The HenryŽs Law constants for these compounds have been determined and found to agree with the published values.
Permanent Link: http://hdl.handle.net/11104/0001898