title: Simple and rapid gas-liquid-solid chromatographic analysis of trace concentrations of acetaldehyde in urban air.
abstract: A simple and rapid gas-liquid-solid chromatographic method for the analysis of trace concentrations of acetaldehyde in urban air (in the Nagoya area) was developed, with the use of cold trapping with liquid oxygen. In the analytical main column the conditions were: stationary phase, Triton X-100 (0.4%); support, Carbopack B (60-80 mesh); glass column, 1.5 m X 3 mm I.D.; column temperature, 75 degrees; carrier gas (nitrogen) flow-rate, 50-80 ml/min. In the cold trapping pre-column the conditions were: stationary phase, Tris (2-cyanoethoxy) propane (25%); support, Shimalite (AW, DMCS) (60-80 mesh); glass column, 31 cm X 4 mm I.D.; operating temperature for the trapping, -183 degrees (liquid oxygen temperature); operating temperature for injection of the condensed sample into the gas chromatograph, increased from -183 degrees to +100 degrees for 2 min. The acetaldehyde peak was identified by the disappearance method with a 2,4-dinitrophenylhydrazine-orthophosphoric acid-glass beads column. The ranges and average concentrations of acetaldehyde detected in 13 urban air samples were 1.5-9.6 and 4.7 ppb, respectively.
mesh_terms: D000079:Acetaldehyde / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D001322:Autoanalysis; D002849:Chromatography, Gas; D002853:Chromatography, Liquid; D008722:Methods; D014131:Trace Elements / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D014131:Trace Elements; D000079:Acetaldehyde