Abstract
The improvement and application of a previously reported on-line thermionic detection system for reversed-phase liquid chromatography (LC-TID) are described. Modifications have been made to simplify the introduction of the LC effluent to the evaporation interface. The vaporized effluent is directed into the base of a gas chromatographic-thermionic detection (GC-TID) system via a heated fused-silica capillary and is swept into the detector using a minimal flow of nitrogen gas. Minimum detectable amounts of 0.2–0.5 pg/s of phosphorus were achieved for a variety of phosphorus-containing compounds, including several polar pesticides. Repeatability, at a level of 5 ng of injected compound, gives relative standard deviations ranging from 2 to 5%. Applications are reported for the determination of polar phosphorus pesticides in complex plant matrices. Results obtained with the unmodified detector are compared with those obtained using the present modified system.
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