Method OTM-27

Determination of PM10 and PM2.5 Emissions From Stationary Sources (Constant Sampling Rate Procedure)

This method determines PM10 and PM2.5 from stack emissions. A sample of the stack gas is extracted at a predetermined constant flow rate through an in-stack sampling device (cyclone) and collected on a glass fiber, quartz or Teflon filter. The device separates the 2.5 and 10 micron particles. the sampling train is similar to a Method 5 train and contains a filter holder, heated probe, and a set of chilled impingers which contain DI water followed by an empty impinger and silica gel impinger. The particulate determination is done gravimetrically. This method cannot be sued to measure emissions following a wet scrubber and my not be suitable for stack temperatures exceeding 260°C. Fractions collected during the sample recovery are particles greater than or equal to 10 microns, particles less than 10 microns but greater than 2.5 microns, and particles less than or equal to 2.5 microns. During sample recovery the filter is removed and put into a petri dish labeled Container 1. Any lose particulate on the filter holder is also put into the container. This fraction contains particulates ≤ 2.5 microns. The particulates from the cyclone I cup and acetone rinse of the cyclone cup, internal surface of the nozzle, and the internal surfaces of cyclone I are put into a glass container and labeled Container 2. The liquid level should be marked on the outside of the bottle. This fraction contains particulates > 10 microns. The solids from cyclone cup IV and the acetone rinses of the cyclone I turnaround cup, inside of the downcomer line, and interior surfaces of the cyclone IV are ut into a glass container and the liquid level is marked. This is Container 3 and contains the particulates ≤ 10 microns but > 2.5 microns. The acetone rinses of the exit tube of cyclone IV and the front half of the filter holder are put into a glass container and the liquid level marked. This is Container 4 and it contains the particulates ≤ 2.5 microns. Each container is analyzed separately for particulates.

(EPA 40CFR Part 61 Appendix M)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in the method.
Preservatives:   None specified in the method
Required Preps:   Pre-tared Glass fiber, quartz or Teflon filter with no organic binders.
Collection Method:   OTM-027 Sampling train
Analytical Methodology:   Gravimetric
Documentation:   OTM-27

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.