Measurement of volatile organics at part per billion concentrations using a cold trap inlet and high speed gas chromatography.
Mouradian-RF; Levine-SP; Ke-Q; Alvord-HH
J Air Waste Manage Assoc 1991 Aug; 41(8):1067-1072
An improved gas chromatography system was developed that featured a custom built high speed electometer with improved noise suppression. The new design had adjustable analog filtering which could be changed to meet the needs of the current analysis. The gas cooled inlet was used to collect and focus organic vapors from injection volumes of up to 1 milliliter. Resistance heating of the metal cold trap produced a narrow injection band that allowed simple separations to be completed in 5 to 20 seconds. The response time and noise suppression characteristics were adjusted to the needs of the specific analysis using a variable speed electrometer amplifier. In 20 seconds or less, simple mixtures of organics were separated including aromatics, alkanes and chlorinated hydrocarbons. The detection limits were determined for a variety of common organics and shown to range from less than 1 to about 50 parts per billion by volume. The system had the potential for high speed analysis of some volatile organics at concentrations that are significant in ambient air. The authors suggest that the use of a cold trap inlet may be an approach for near real time measurement of volatile organics in ambient air.
NIOSH-Publication; NIOSH-Author; NIOSH-Grant; Grants-other; Chromatographic-analysis; Air-quality-monitoring; Air-sampling; Chlorinated-hydrocarbons
Environmental & Indust Health School of Public Health II 1420 Washington Heights Ann Arbor, MI 48109-2029
Journal of the Air and Waste Management Association
University of Michigan at Ann Arbor, Ann Arbor, Michigan