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    Large Volume Sampling Without Preconcentration for Continuous Gas Chromatography

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    A milligram quantity of adsorbent material was placed at the head of a gas chromatographic column. The initial part of the column itself served as this adsorbent in some experiments. A continuously flowing gaseous sample was passed through a length of narrow bore metal tubing, the precolumn adsorbent, and the gas chromatographic column. A computer generated signal heated the metal tubing which heated the sample gas stream and the precolumn adsorbent. The changing adsorbent temperature generated a changing concentration of adsorbable substances in the gas stream. Thus, the computer generated a chemical concentration signal usable for chromatographic analysis. This technique is related to chromatographic analysis using preconcentration but has several important advantages.


    gas chromatography, adsorbents, preconcentration, cross correlation, atmospheric analysis, sampling, toxic materials

    Author Information:

    Phillips, JB
    Southern Illinois University, Carbondale, Ill.

    Valentin, JR
    Southern Illinois University, Carbondale, Ill.

    Carle, GC
    Ames Research Center, Moffett Field, Calif.

    Committee/Subcommittee: D22.04

    DOI: 10.1520/STP33992S