STP1075

    The Automated Determination of Volatile Organic Contaminants in Ambient Air and/or Soil Gas by Gas Chromatography with Selective Detectors

    Published: Jan 1991


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    Abstract

    Volatile Organic Contaminants (VOCs) are major air pollutants in our environment. Whole air sampling has become the primary method for sampling air with EPA method TO-14. With this technique, an air sample is drawn through a cryogenically cooled trap to freeze out and concentrate VOC contaminants. The trap is then quickly heated and the VOCs are transferred to a cryogenically cooled column. Several variations and improvements have been studied: 1) automation for multiple samples, 2) use of a variable temperature absorption trap to eliminate cryogenics and a water removal device, and 3) elimination of the requirement for a cryogenically cooled oven. Two automated analytical systems are discussed: a fixed and a variable volume system. Precision, method detection limits, system linearity, and carryover are reported. Finally, ambient, dry-cleaner, and indoor air samples are analyzed using the techniques described.

    Keywords:

    Ambient Air, Soil Gas, VOCs, Canister, Air Contaminants


    Author Information:

    Kirshen, N
    Senior Chemist, and Chemist, Varian Chromatography Systems, Walnut Creek, California

    Almasi, E
    Senior Chemist, and Chemist, Varian Chromatography Systems, Walnut Creek, California


    Paper ID: STP25467S

    Committee/Subcommittee: D18.14

    DOI: 10.1520/STP25467S


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