REPRODUCIBILITY OF ANALYSIS ON 7 CHLOROBIPHENYLS IN DIFFERENT ENVIRONMENTAL SAMPLES
Over the past decade, a number of different methods have been developed to quantify polychlorinated biphenyls (PCBs) in various matrices. According to recent interlaboratory studies for the determination on PCBs, the only valid approach for comparative, quantitative analysis consists in using a series of individual CBs as primary standards. The selection of the individual congeners may vary with the circumstances, and the list of compounds may be extended beyond the seven CBs routinely determined in many European laboratories. Prior to any proposed intercalibration programme, the complexity of the analysis (both in terms of the separation of the target CBs from the matrix, and from other CBs and organochlorine residues in the sample) requires a learning programme, based on a simple stepwise approach. It should begin with the analysis of standard solutions of known concentration in order to check all analytical protocols and optimisations and then progress to cleaned-up samples in order to check extraction and sample preparations before analysing any environmental sample. Only in this way the CV(R) can be minimized to a level comparable with or better than the Horwitz-curve. The recent BCR interlaboratory results obtained on fish oil and sludge show that learning by stepwise approach will lead to the predicted CV(R).
Bibliographic Reference: 24TH INTERNATIONAL SYMPOSIUM ADVANCES IN CHROMATOGRAPHY, BERLIN/WG, SEPT. 8-10, 1987, AVAILABILITY: CEC-LUXEMBOURG, DG XIII/A2, BP 1907, MENTIONING PAPER ORA 33632 E
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Record Number: 1989126060600 / Last updated on: 1989-05-01
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