SAMPLINGS OF PCDDS AND PCDFS AT THE MWI-SPITTELAU-VIENNA

Since several countries have released statutory emission limits for PCDDs and PCDFs in the range of 0.1 ng 2,3,7,8-TCDD TE/Sm-3, reliable sampling and analytical procedures must be established in order to guarantee reproducible results. Extraction, clean-up and analytical procedure are nowadays considered to be no longer a major source of error, but much greater uncertainties are related to non-representative sample collection, the possibility of artefacts resulting in discrepant results and small recoveries. In order to test the representativity of regular samplings performed in monthly intervalls over a period of 1 year at the MWI Spittelau in Vienna several test runs were performed. To assess the intralaboratory deviation of the sampling and analytical method under field conditions six simultaneous samplings were carried out. In addition a long term sampling over a period of 11-days was performed.