Abstract
Abstract A new technique for rapidly screening for the presence of PCBs in soil has been developed and tested in a field monitoring situation. The technique employs an atmospheric pressure chemical ionization mass spectrometer system mounted in a van to provide on-site mass spectrometric identification and quantitation of the compounds. A small soil sample is heated in a flowing stream of pure nitrogen, and the vaporized material is trapped on an adsorber which is thermally desorbed into the ion source of the mass spectrometer. A detection limit of approximately 1 /ig/g of Aroclor 1254 has been achieved, with a total analysis time per sample of approximately 5 minutes. The process makes possible the direct analysis of soil samples without any chemical workup or preseparation.
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