Abstract
Publisher Summary Gas chromatography/ mass spectrometer (GC/MS) provides the most powerful and advanced technique available at present for the solution of environmental problems. When used in the full scanning mode, it provides sensitivity at least equivalent to that of the gas chromatograph equipped with flame ionization detector (FID). The GC/MS system also provides valuable structural information that permits unambigous identification of all compounds detected. When the GC/MS system is used in the selected ion monitoring mode, it provides sensitivities that often surpass those of a GC equipped with electron capture but still has the specificity to unambiguously identify the compound of interest while discriminating against interfering contaminants and other compounds. The most advanced GC/MS systems incorporate both EI and CI modes of ionization. The information gathered in each of these modes is complementary when detecting and identifying unknowns. The value of high resolution glass capillary columns is used in combination with fast scanning quadrupole MSs. Most systems of the future will incorporate this type of capability to optimize the task of separation and identification of complex mixtures such as organic pollutants in water.
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