Summary
A short stainless steel column packed with silica gel is cooled to −78°C and atmospheric hydrocarbons are preconcentrated from 3 I of air on it. Desorption to the analytical column is by heating for 10 min to 200°C. Analysis is by GC on OPN-Poracil C at 27°C. The sorption efficiencies were nearly 100% for most of the light hydrocarbons.
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Netravalkar, A.J., Mohan Rao, A.M. Estimation of C2−C5 hydrocarbons in air by pre-concentration on silica gel at dry ice temperature. Chromatographia 22, 183–186 (1986). https://doi.org/10.1007/BF02257323
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DOI: https://doi.org/10.1007/BF02257323