Abstract
In time-programmed limited mass scan gas chromatography—mass spectrometry, discrete portions of the mass range are selected to monitor the presence of characteristic groups of ions. The selection of the mass ranges monitored is adjusted automatically during chromatography to match the elution times of compounds of interest. This report describes the application of automated limited mass scan gas chromatography—mass spectrometry in conjunction with glass capillary gas chromatography for determination of polychlorinated biphenyls (PCBs) in process streams and environmental samples. The approach provides an optimal trade-off of sensitivity and selectivity for determination of (PCBs) with electron impact ionization or negative ion chemical ionization mass spectrometry. The reduction of interferences may allow less rigorous sample pretreatment and concentration steps and increase the confidence of peak assignments.
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