We are presenting the use of BÜCHI's Extraction Unit B-811 for isolating polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) from solid environmental samples (soil, grass) under standard conditions and by means of hot extraction. The extracts received will be further processed by means of an internationally recognized method and analyzed with high-resolution GC/MS in the single-ion monitoring (SIM) mode.
The results prove unambiguously that a four-hour extraction period is sufficient when using hot extraction. Consequently, eight extractions can be carried out with an extraction system per working day. The compact sealing system and the fact that it is possible to forego further purification steps make it possible to save 70% of the solvent.