Recent developments in NIST standard reference materials for polycyclic aromatic hydrocarbons in environmental matrices

The National Institute of Standards and Technology (NIST) has recently issu ed several new environmental matrix SRMs, including air and diesel particul ate matter, marine sediment, and mussel tissue with certified and reference concentrations for polycyclic aromatic hydrocarbons (PAHs). New marine-rel ated SRMs include: SRM 1944 New York/New Jersey Waterway Sediment, SRM 2974 Organics in Freeze-dried Mussel Tissue, SRM 2977 Mussel Tissue (Organic Co ntaminants and Trace Elements). and SRM 2978 Mussel Tissue (Organic Contami nants - Raritan Bay. New Jersey). SRM 2975 Diesel Particulate Matter (Indus trial Forklift) and SRM 1975 Diesel Particulate Extract (a dichloromethane extract of the particulate matter used for SRM 2975) represent two new dies el particulate-related materials. In addition two existing materials, SRM 1 649a Urban Dust and SRM 1650a Diesel Particulate Matter were recently reiss ued with certified and reference values for over 40 PAHs.