A new method is presented allowing the determination of PAHs in the highly problematic organic humus layers of forest soils. Emphasis was put on the extraction process and on a reliable quantification procedure. Fundamental elements of the developed method are: saponification of samples in an ultrasonic bath, partitioning of PAHs into hexane, clean-up of extracts by means of solid-phase extraction, and quantification by GC-MS using deuterated internal standards.
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