Aerosol
A standard reference material that exemplifies atmospheric particulate matter also is currently available from NIST. Urban Dust Standard Reference Material (SRM) 1649a is an atmospheric particulate material collected in the Washington DC urban area from 1976-1977, using a baghouse specially designed for this purpose. The particulate material was collected over a period of more than 12 months, and therefore represents a time-integrated sample. While the sample is not intended to be representative of the area in which it was collected, it should generally typify atmospheric particulate matter obtained from an urban area. This material is intended for use in evaluating analytical methods for the determination of selected polycyclic aromatic hydrocarbons (PAH), polychlorinated biphenyl congeners, chlorinated pesticides, and total carbon in atmospheric particulate material and similar matrices. Analytical results for the black carbon component, determined as elemental carbon, clustered at about 13 g, 49 g and 81 g of elemental carbon per kg of material, giving evidence of method dependence. This SRM also has information and/or reference values for natural C-14 in several chemical fractions, including elemental carbon and certain PAH.
Ordering information
NIST-Standard SRM 1649a has been superseded by SRM 1649b - Urban Dust, which is available from www.nist.gov/srm. Please note that SRM 1649b is prepared from the same bulk material as SRM 1649 and SRM 1649a, but it has been sieved to a smaller particle size resulting in some differences in the concentrations of the target analytes. More details you may find in the SRM 1649b certificate (PDF).
Cost: USD 593 per 2g (certified) (price as on 15 April 2011).