A previously described method for the quantitative analysis of C 2 ‐ C 6 hydrocarbons in the ppt range based on cryogenic preconcentration has been improved further. Problems caused by condensation of O 2 and traces of water from the sample were overcome using a modified dyring procedure and a tandem preconcentration trap. In addition, the flow path through the unit was simplified further. Technical details are given. The reproducibility of both quantitative results and retention times was improved by these modifications. Typical standard deviations were in the order of 2% at the 200 ppt level.
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Schmidbauer et al. (1986) studied this question.
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