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Improved resolution and determination of ambient C5−C12 hydrocarbons by GC-coupled refocussing system

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Summary

A homemade cryogenic system derived from readily available material is described, illustrating its usage as an accessory for adsorption/thermal desorption chromatography. A small Chromsorb-W-HP packing (1 cm) was introduced into a deactivated precolumn as a cryofocussing, preconcentrating unit. This was able to retain the analyte which had been thermally desorpted from a Tenax TA sampling tube at a relatively higher temperature (−80°C∼−90°C), with the analyte also reinjected on the analytical column in a relatively narrow band. Average overall recoveries for 24 hydrocarbons tested were 97.5%. Cryofocussing enhanced sensitivity and improved resolution. Field studies at a petroleum industry site were carried out and the accessory proved to be useful for complex C5−C12 hydrocarbon analysis in ambient air.

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Authors and Affiliations

  1. Institute of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, ROC

    J. -G. Lo & T. -Y. Chen

  2. Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, ROC

    T. -L. Tso

Authors
  1. J. -G. Lo
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  2. T. -Y. Chen
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  3. T. -L. Tso
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Lo, J.G., Chen, T.Y. & Tso, T.L. Improved resolution and determination of ambient C5−C12 hydrocarbons by GC-coupled refocussing system. Chromatographia 38, 151–157 (1994). https://doi.org/10.1007/BF02290328

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  • DOI: https://doi.org/10.1007/BF02290328

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