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Beschreibung

This Reference Material (RM) 8786 is the filter blank for the production of RM 8785 Air Particulate Matter (PM)on Filter Media. NIST-RM 8785 is intended primarily for use in the evaluation of analytical methods used to characterize the carbon composition of atmospheric fine-particulate matter (PM) for national air quality monitoring programs. NIST-RM 8785 consists of only the fine fraction (nominally < 2.5 µm aerodynamic diameter) of NIST-1649a Urban Dust re-suspended in air and filtered onto quartz-fiber filter. NIST-RM 8785 was produced at SRI International by re-suspendingSRM 1649a in air and by collecting the aerosol on 320 quartz-fiber filters in each of 7 batches for a total of 2240 filters. A unit of NIST-RM 8786 consists of a single production blank filter with a 37 mm diameter.