Abstract
Direct coupling of a capillary supercritical fluid chromatograph to a benchtop electron ionization (EI) mass spectrometer using a GC-MS interface with minor modification is described. The SFC-EI-MS of the thermally labile pesticides aldicarb, diuron, methiocarb, alachlor, bendiocarb, and carbaryl plus other analytes have been obtained with good chromatographic integrity and sensitivity. This system routinely provided low nanogram level detection in the full scan mode for the pesticides as well as picogram levels for some selected analytes. The highest %R.S.D. for repeated injections of naphthalene over a two-week period using this benchtop SFC-EI-MS system was 6.4. The EI-mass spectra have been successfully searched using conventional mass spectral libraries.
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