Analysis of urban particulate standard reference materials for the determination of chlorinated organic contaminants and additional chemical and physical properties |
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Authors: | D L Poster Michele M Schantz Stephen A Wise Mark G Vangel |
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Institution: | (1) Analytical Chemistry Division, U.S. Department of Commerce, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA e-mail: poster@nist.gov, US;(2) Statistical Engineering Division, U.S. Department of Commerce, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA, US |
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Abstract: | A previously issued National Institute of Standards and Technology (NIST) Standard Reference Material (SRM), SRM 1649, Urban
Dust/Organics has been analyzed for chlorinated organic contaminants (polychlorinated biphenyls and chlorinated pesticides)
to provide certified values for a new class of compounds relative to the former certification. The material will be reissued
as SRM 1649a. Four different analytical techniques were used. Specifically, two different methods of extraction (Soxhlet and
pressurized fluid extraction) were used in conjunction with sample analysis by gas chromatography with two different columns
(5% phenyl-methyl polysiloxane and 50% methyl C-18 dimethyl polysiloxane) that exhibit distinct selectivity, and with two
different modes of detection (electron capture detection and mass spectrometry). The results from these techniques were combined
to generate certified concentrations for 35 PCB congeners (some in combination) and 8 chlorinated pesticides. Ancillary assessments
of additional chemical and physical properties of SRM 1649a include homogeneity, moisture, total organic carbon, extractable
mass, and the particle-size distribution. The approach and the results for the certification of the PCB congeners and chlorinated
pesticides in SRM 1649a, and the determination of the additional chemical and physical properties are described. In addition,
the determination of PCBs and chlorinated pesticides in SRM 1648, Urban Particulate Matter (a particulate material certified
for inorganic constituents), is also discussed although certified values are not presented.
Received: 8 June 1998 / Revised: 4 September 1998 / Accepted: 26 September 1998 |
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