PCBs constitute a large problem in European environmental management. PCBs have been included in the black list of EC-directive 76/464/EEC owing to the quantities used and discharged, their toxicological and accumulation properties and their persistence. For environmental management, PCBs are frequently determined in fresh water sediments. Comparison of the degree of PCB-contamination between different countries is virtually impossible owing to interlaboratory differences. Evaluation in interlaboratory studies on PCB determinations in sediments reveal that systematic deviations form an important source of incomparability.
The objective of this project is to produce a sediment reference material certified for various polychlorobiphenyls to improve the interlaboratory comparability.
The project involves the following six major tasks:
- collection of the raw sediment material;
- pre-treatment involving homogenization and bottling;
- homogeneity study;
- stability study;
- organisation of the certification campaign of seven polychlorobiphenyls (CB 28, 52, 101, 118, 138, 153 an 180);
- technical and statistical evaluation of the data and writing of the certification report.
The certification should be completed at the end of 1995.