Accession Number:

ADA285666

Title:

Simultaneous Gas-Chromatographic Determination of Four Toxic Gases Generally Present in Combustion Atmospheres

Descriptive Note:

Final rept.

Corporate Author:

FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST

Report Date:

1994-09-01

Pagination or Media Count:

13.0

Abstract:

Measurement of combustion gases produced by burning aircraft cabin materials poses a continuing limitation for smoke toxicity research. Since toxic effects of gases depend on both their concentrations and duration of exposures, frequent atmosphere sampling is necessary to define the concentration-time curve. A gas chromatographic method was developed for the simultaneous analyses of carbon monoxide CO, hydrogen sulfide H2S, sulfur dioxide SO2, and hydrogen cyanide HCN. The method utilized an MTI M200 dual-column gas chromatograph GC equipped with 4-m molecular sieve-5A and 8-m PoraPlot-U capillary columns and two low-volume, high-sensitivity thermal conductivity detectors. Detectability ppmretention times seconds for the gases were CO 10028 H2S 5026 SO2 12576 HCN 60108. The method was effective for determining these gases in mixtures and in the combustion atmospheres generated by burning wool CO, HCN, and H2S and modacrylic CO and HCN fabrics. Common atmospheric gaseous or combustion products oxygen, carbon dioxide, nitrogen, water vapor, and other volatiles did not interfere with the analyses. However, filtration of the combustion atmospheres was necessary to prevent restriction of the GC sampling inlet by smoke particulates. The speed, sensitivity, and selectivity of this method make it suitable for smoke toxicity research and for evaluating performance of passenger protective breathing equipment.

Subject Categories:

  • Toxicology
  • Physical Chemistry
  • Combustion and Ignition
  • Air Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE