STP786

    Large Volume Sampling Without Preconcentration for Continuous Gas Chromatography

    Published: Jan 1982


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    Abstract

    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.

    Keywords:

    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.


    Paper ID: STP33992S

    Committee/Subcommittee: D22.04

    DOI: 10.1520/STP33992S


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