On-Column Bromine -and Chlorine-selective Detection for Capillary Gas Chromatography Using a Radio Frequency Plasma

Stig Pedersen-Bjergaard*, Tyge Greibrokk

*Corresponding author af dette arbejde
    54 Citationer (Scopus)

    Abstract

    A 350-kHz rf plasma sustained inside the end of a 0.25- or 0.32-mm-i.d. fused-silica GC column was evaluated for element-selective detection of brominated and chlorinated compounds separated by gas chromatography. Due to the small volume of the plasma cell, dilution of the GC effluent with make-up gas was unnecessary and a stable 25-W plasma was maintained in only 1.5-5 mL/min GC carrier gas. With the plasma sustained in pure helium, carbon formed from eluting material was deposited in the plasma region causing serious peak tailing and loss of sample. This was avoided by doping the GC carrier gas with traces of oxygen. With the 350-kHz rf plasma sustained on-column, detection limits for bromine and chlorine were improved by a factor of 50 to 0.9 and 1.1 pg/s, respectively. For both bromine and chlorine, element-to-carbon selectivities approaching 103:1 and detector linearity over at least 3 orders of magnitude were obtained. The on-column detection system has been applied to a screening for halogenated compounds in snow from Antarctica and in drinking water produced offshore.

    OriginalsprogEngelsk
    TidsskriftAnalytical Chemistry
    Vol/bind65
    Udgave nummer15
    Sider (fra-til)1998-2002
    Antal sider5
    ISSN0003-2700
    DOI
    StatusUdgivet - 1 aug. 1993

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