A portable, high-speed, vacuum-outlet GC vapor analyzer employing air as carrier gas and surface acoustic wave detection

Analytical Chemistry
Joshua WhitingRichard Sacks

Abstract

Vacuum-outlet GC with atmospheric-pressure air as the carrier gas is implemented at outlet pressures up to 0.8 atm using a low-dead-volume polymer-coated surface acoustic wave (SAW) detector. Increases in the system outlet pressure from 0.1 to 0.8 atm lead to proportional increases in detector sensitivity and significant increases in column efficiency. The latter effect arises from the fact that optimal carrier gas velocities are lower in air than in more conventional carrier gases such as helium or hydrogen due to the smaller binary diffusion coefficients of vapors in air. A 12-m-long, 0.25-mm-i.d. tandem column ensemble consisting of 4.5-m dimethyl polysiloxane and 7.5-m trifluoropropylmethyl polysiloxane operated at an outlet pressure of 0.5 atm provides up to 4 x 10(4) theoretical plates and a peak capacity of 65 (resolution, 1.5) for a 3-min isothermal analysis. At 30 degrees C, mixtures of vapors ranging in vapor pressure from 8.6 to 76 Torr are separated in this time frame. The SAW detector cell has an internal volume of < 2 microL, which allows the use of higher column outlet pressures with minimal dead time. The sensor response is linear with solute mass over at least 2-3 decades and provides detection limits of 20-50 ...Continue Reading

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Citations

Jul 25, 2003·Journal of Chromatography. a·Eva Matisová, Milena Dömötörová
Jun 19, 2004·Journal of Occupational and Environmental Hygiene·Meng-Da Hsieh, Edward T Zellers
Nov 4, 2015·Critical Reviews in Analytical Chemistry·Mingjun XuYong Liu
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Feb 14, 2006·Journal of Environmental Monitoring : JEM·Chia Jung LuEdward T Zellers
Jul 1, 2009·Analytical Chemistry·Matthew J AerneckeDavid R Walt
Feb 15, 2008·Analytical Chemistry·Siyka I ShopovaShiou-jyh Ja
Jul 2, 2002·Analytical Chemistry·Gary A EicemanFrank Dorman
Nov 25, 2020·Analytical Chemistry·Laura Alonso SobradoJérôme Randon
Oct 26, 2018·Analytical Chemistry·Bishnu P Regmi, Masoud Agah
Oct 24, 2007·Environmental Science & Technology·Bobby PejcicAndrew Ross
May 1, 2004·Analytical Chemistry·Gordon LambertusRichard Sacks

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