NIOSH 5040 (Issue 3)


This test method uses a Thermal-optical analysis; flame ionization detector (FID) technique to detect elemental carbon. The split between organic carbon (OC) and EC may be inaccurate if the sample transmittance is too low. The EC loading at which this occurs depends on laser intensity. In general, the OC-EC split may be inaccurate when EC loadings are above 20 μg/cm2 . High loadings can give low (and variable) EC results because the transmittance remains low and relatively constant until some of the EC is oxidized. The split should be reassigned (prior to EC peak) in such cases. An upper EC limit of 800 μg/m3(90 μg/cm2 ) can be determined.

Analysis Type (Application Method): Thermal-optical analysis (TOA); flame ionization detector (FID)

Link to NIOSH 5040 (Issue 3) Method

Compatible Filters:

37 mm quartz-fiber filter in a 3-piece cassette with filter support (stainless steel screen, cellulose pad, or a second quartz filter). Aerosol adapter, forceps.


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