NIOSHTIC-2 Publications Search
Gas Chromatographic Method for Analyzing Gases Associated With Coal.
NTIS: PB 234 072 :9 pages
Gas samples containing o2, n2, h2, he, co2, CO, ch4, and trace amounts of c2 to c5 hydrocarbons are analyzed by a gas chromatographic method that utilizes both thermal conductivity and flame ionization detectors. A porous polymer support and molecular sieve columns are used with argon as the carrier gas. A column selector valve makes it possible to perform a complete analysis either on one 1-ml sample in 40 minutes or on two samples in 20 minutes, one sample for each detector. Samples are introduced either by on-column injection or through a gas sampling valve. By varying operational parameters, the speed, sensitivity, and accuracy of analysis may be modified to suit a particular situation.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 234 072
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division