The degradation products extracted by SPME were identified in a Finnigan SSQ 7000 mass spectrometer (El mode) connected to a Varian 4000 GC. ... The liquid extraction products were identified by using a GCQ gas chromatograph-mass spectrometer (EI mode). ... Extraction of degradation products A solid phase microextraction fibre holder, for manual use from Supelco was used for SPME extraction.
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