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 efluent 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
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