Abstract
A highly sensitive and accurate method for the quantitative analysis of a wide range of low-molecular-weight oxygenated hydrocarbons in ambient air is described. Samples were collected on cryogradient sample tubes, transferred to the gas chromatograph by gentle heat desorption and analyzed by two-dimensional gas chromatography. The samples were separated on a packed column [1,2,3-tris(2-cyanoethoxy)propane on Chromosorb W AW], then refocused on-line in a fused-silica capillary cold-trap, followed by on-line splitless reinjection into a fused-silica capillary column (50 m × 0.3 mm I.D., non-polar stationary phase). The detection limit for a typical oxygenate was 0.1 gmg/m 3 using a 3-1 sample volume. The precision of the method was better than 12% relative standard deviation for compounds in the low gmg/m 3 range.
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