Glass fiber filter internal standards

Air (CDDs) Collection of sample onto glass fiber filter/polyurethane foam cartridge addition of internal standard Soxhlet extraction with toluene volume reduction clean-up and fractionation on Florisil , elutiion with toluene/diethylether, evaporation and redissollution in cyclohexane clean-up on modified silica gel using HPLC and hexane/diethyl ether volume reduction HRGC/LRMS (EI/SIM) HRGC/LRMS (NCI/SIM) 0.1-1 pg/m3 0.2-3 pg/inj (0.01-0.1 pg/m3) 80-122 86-102 Oehme et al. 1986... 

Collection on XAD and glass-fiber filters with 2-D labeled PAH Internal standards extraction with toluene fractionation and clean-up on activated silica and alumina... 

A known volume of air is drawn at 1.51/min through a filter cassette containing a sodium bisulfate-treated glass-fiber filter. A minimum sampling time of 1 h is recommended. The treated filter is transferred to a centrifuge tube and extracted in ethanol/water/sodium hydroxide solution and back-extracted into ammoniated heptane using N-ethylnornicotine as internal standard. An aliquot of the heptane layer is analyzed by gas chromatography with thermionic-specific detection. 

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