Interlaboratory validation of PCDD and PCDF concentrations found in municipal incinerator emissions

Abstract Extracts from five stack-gas samples and a National Bureau of Standards dust sample were analyzed for PCDDs and PCDFs by three laboratories. The coefficients of variation were less than 50% for 84% of the results from the analysis of 2,3,7,8-tetra-CDD, 2,3,7,8-tetra-CDF and the tetra- to octa- congener groups.