Abstract
Standard Reference Material (SRM) 1974a, Organics in Mussel Tissue (Mytilus edulis), has been issued with certified and noncertified concentrations for 33 polycyclic aromatic hydrocarbons (PAHs). SRM 1649, Urban Dust/Organics, which was issued in 1982, has been reanalyzed to provide certified and noncertified concentrations for 35 PAHs. Both materials were analyzed using four different analytical techniques based on gas chromatography/mass spectrometry on different stationary phases and on reversed-phase liquid chromatography with fluorescence detection.