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

Since several countries have released statutory emission limits for PC DDs and PCDFs in the range of 0.1 ng 2,3,7,8-TCDD TE/Sm-3, reliable sa mpling and analytical procedures must be established in order to guara ntee reproducible results. Extraction, clean-up and analytical procedu re are nowadays considered to be no longer a major source of error, bu t much greater uncertainties are related to non-representative sample collection, the possibility of artefacts resulting in discrepant resul ts and small recoveries. In order to test the representativity of regu lar samplings performed in monthly intervalls over a period of 1 year at the MWI Spittelau in Vienna several test runs were performed. To as sess the intralaboratory deviation of the sampling and analytical meth od under field conditions six simultaneous samplings were carried out. In addition a long term sampling over a period of 11-days was perform ed.