TCEQ Method 23 - Particulate Emissions

Method Overview

  • Isokinetic.
  • Heated out of stack filter (M5).
  • "Condensable" particulates pass through the filter and condense in impingers. Can readily be combined with a CPM Method.
  • Tester may adjust out-of-stack filter temperature to suit source specific conditions.

Target Compounds

  • Particulate Matter (PM) -- those substances retained in the sampling nozzle/probe, on a heated filter and simple condensables from an impinger catch.

Performance Tips

  • Filterable Particulate Matter
    • During sampling a filter is maintained at a specified temperature (248oF + 25oF)
    • Do not use silicone grease - it can be soluble in the probe rinse and can bias the PM value high.
    • Run the train isokinetically.
    • Stainless steel nozzles should be used with great care, port scrapings can bias results high.


  • Acetone must be shipped as a hazardous material. Please call for IATA codes if you need them.
  • Samples may be shipped at ambient temperatures.
  • It may prove more economical to keep acetone rinses separate, ship other samples normally, and the acetone as hazardous.
  • Be sure to include a chain of custody for each shipping container.


  • Applicable for sources where oxides of sulfur are not present (No SO2, SO3 or Acid Mist).
    • See TCEQ Method 24 for Sources containing oxides of sulfur.
  • Can be used for Condensable Particulate Matter (CPM).


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