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Abstract
Low-pressure and atmospheric-pressure microwave-induced helium plasma detectors were interfaced with a capillary column gas chromatograph. A number of dialkyl mercury, diaryl mercury and monoalkyl mercury chlorides have been separated on both systems. The capillary column is well suited for the separation of organomercury compounds, but the selection of the appropriate scavenge gas is critical to achieve good peak shapes for these mercury compounds. The atmospheric pressure system exhibited better sensitivity and selectivity for organomercury compounds than the low-pressure system. In addition to the organomercury compounds, satisfactory separation has been achieved for trimethyl, triethyl and triphenylarsine on the gas chromatograph lowpressure microwave plasma detector system. Preliminary work using the atmospheric-pressure system for arsenic and selenium line selection is also presented.
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