ASTM WK65699

    Revision of D6196 - 15e1 Standard Practice for Choosing Sorbents, Sampling Parameters and Thermal Desorption Analytical Conditions for Monitoring Volatile Organic Chemicals in Air

    (What is a Work Item?)

    Active Standard: D6196 - 15e1

    Developed by Subcommittee: D22.05 | Committee D22 | Contact Staff Manager



    WK65699


    Keywords

    Place the sorbent or carrier tube in a compatible thermal desorption apparatus. As each tube in turn is sealed into the analytical flow path, system integrity should be checked to ensure there are no leaks which could lead to sample losses. Purge the air from each tube before heat is applied to avoid chromatographic artifacts arising from oxidation of the sorbent or damage to the chromatographic system. Heat the tube to displace the organic vapors which are passed (usually by means of a focusing (cold) trap ()) to the gas chromatograph by means of a carrier gas stream. The gas flow at this stage shall be the reverse of that used during sampling, that is, the sampling end of the tube should be nearest the gas chromatograph column inlet. The gas flow through the tube should be in the order of 30 to 50 mL/min for optimum desorption efficiency. For the initial air purge, it is usually necessary to use 10× the tube volume (that is, 20 to 30 mL) of inert gas to completely displace the volume of air (2 to 3 mL) in the tube. However, larger volumes of carrier gas may be required to completely purge air and water from the strongest sorbents (see ). ; ambient air; diffusive sampling; indoor air; pumped sampling; volatile organic compounds; workplace air;;

    Rationale

    There is disagreement on the legal standing for the content presented section 13.4.2. This ballot is to start the revision process by getting an official ballot on the record. The committee agreed upon action for this ballot is to remove section 13.4.2.

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    Work Item Status

    Date Initiated:
    11-05-2018

    Technical Contact:
    Dustin Poppendieck

    Item:
    003

    Ballot:
    D22.05 (19-01)

    Status:
    Negative Votes Need Resolution