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This Standard Reference Material (SRM) is intended for use in evaluating analytical methods for the determination of selected polycyclic aromatic hydrocarbons (PAHs), nitro-substituted PAHs (nitro-PAHs), polychlorinated biphenyl (PCB) congeners, chlorinated pesticides, and inorganic constituents in atmospheric particulate material and similar matrices. In addition to certified values, reference or information values are also provided for decabromodiphenyl ether and selected toxaphene congeners, polychlorinated dibenzo-p-dioxin and dibenzofuran congeners, and inorganic constituents. Information values are provided for hydrocarbons, hopanes, steranes, ketones, and particle-size characteristics. All of the constituents for which certified, reference, and information values are provided in SRM 1649b are naturally present in the particulate material. SRM 1649b was prepared from the same particulate material that was issued in 1982 as SRM 1649 and re-issued in 1999 as SRM 1649a however, the bulk material was sieved to a smaller particle size fraction. A unit of SRM 1649b consists of a bottle containing 2 g of particulate material. /// Sample value(s) - please ask for current certificate.



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National Institute of Standards and Technology

NIST provides over 1300 Standard Reference Materials® as well as articles and practice guides describing the development, analysis and use of SRMs.

NIST Standard Reference Materials are used by analytical laboratories in industry, academia and government in order to facilitate commerce and trade and to advance research and development. The SRMs are produced by the engineering laboratory, the material measurement laboratory, and the physical measurement laboratory at NIST. They are available for chemical composition, physical properties, and engineering materials.