An analytical technique is described which allows the determination of C2C6 hydrocarbons in the ppt‐range from up to 21 air samples after removal of air humidity. Preconcentration is carried out on a two stage cryotrap system. The compounds are separ ated on a temperature‐programmed capillary coated with Al2 O3. Detection limits (S/N 2:1) of 1.5 to 5 ppt were obtained for air samples from the Arctic. The reproducibility of the method was about 3% at the 50–100 ppt level. Practical problems are discussed in detail.
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Schmidbauer et al. (1985) studied this question.
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