Isotope Ratios as a Characteristic Selection Technique for Mass Chromatography

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Abstract
A selective GC detector has been developed for chlorine containing compounds. The technique involves a GC-MS-computer system. Selectivity has been investigated with polychlorinated pesticides and polychlorinated biphenyls using chlorine isotope ratios to reconstruct mass chromatograms which are characteristic for the number of chlorine atoms found in repetitive-scan spectra. The technique may be used to “fingerprint” compounds on the basis of mass chromatogram peak heights obtained from different numbers of chlorine atoms detected in the repetitive-scan spectra. It also offers major advantages in resolution and specificity when the chlorine containing compound is found in a cluster of unresolved chromatographic peaks.

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