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EXTENSION OF U.S. EPA METHODS 0023A/8290 TO INCLUDE 13C12-LABELLED MONO-, DI-, AND TRI-CHLORINATED DIBENZO-P-DIOXIN AND DIBENZOFURAN STANDARDS
Citation:
Gullett*, B K., J V. Ryan*, AND D. Tabor. EXTENSION OF U.S. EPA METHODS 0023A/8290 TO INCLUDE 13C12-LABELLED MONO-, DI-, AND TRI-CHLORINATED DIBENZO-P-DIOXIN AND DIBENZOFURAN STANDARDS. ORGANOHALOGEN COMPOUNDS 40:121-124, (1999).
Description:
Concentrations of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are typically reported only in terms of the tetra-through octa-CDD/CDF isomers, either as homologue sums or as subsets thereof. This practice is common because the toxic isomers of interest are solely a subset of the tetra- through octa-CDD/CDF homologues and, hence, only the tetra- through octa-CDD/CDF13C12-labelled standards are commercially available. The mono- through tri-CDD/CDF isomers, however, are important toward understanding formation mechanisms and source/receptor relationships. Their relative abundance provides evidence for chemical formation mechanisms and equilibrium composition models. Their concentration levels, relative to the other homologues, provide additional information on the dioxin fingerprint for source attribution.