Abstract
Known mixtures and unknown atmospheric sample extracts containing polychlorinated dibenzo- p-dioxins and polychlorinated dibenzofurans (PCDD/F) were analyzed by both electron impact, high resolution, mass spectrometry (HRMS) and by electron capture, negative ion, low resolution mass spectrometry (ECNI). PCDD/F concentrations measured by the two methods were comparable, typically agreeing within ±33%. The major difference between the two techniques is that HRMS easily detects 2,3,7,8-tetrachlorodibenzo- p-dioxin, but ECNI does not. With this exception, the results suggest that ECNI can be a sensitive, low cost alternative to HRMS for the determination of PCDD/F concentrations.
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