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The mass spectrometric detector (MSD) with electron Ionization gives a molar response for CI"DD/CI,DF ( = 1-8).This response does not depend on the position or the number of chloride atoms but on the molecular skeleton of the CljDD/ CljDF alone. The ratio of the molar response of CIJ)F to CljDD Is 1.35 ± 0.1. The carbon skeleton based molar response of the MSD can simplify the quantitation of CljDD/ CljCF and other arenes In GC/MSD substantially. Used In an appropriate way It may supplement the Isotope dilution technique. The flame Ionization detector (FID) and the atomic emission detector (AED), due to their molar response characteristics for defined elements, can be used for the quantitation of standard solutions In the microgram per milliliter range of polychlorinated dlbenzo-p-dloxlne and dibenzofurans (CljDD/CljDF). Specifically, the highly toxic compounds of the 2,3,7,8-group of the CI,DD/CI"DF do not have to be handled In bulk and can be quantified after capillary GC with nontoxic congeners as references. The molar response of the electron capture detector (ECD) Is structure-dependent and Is higher for CI4DF/CleDF than for CI4DD/CI5DD.

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