EPA Method 5F - Particulate Emissions

Method Overview

  • Isokinetic.
  • Heated out of stack filter at 320oF + 25oF
  • "Condensible" 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.
  • Stainless steel nozzles should be used with great care, port scrapings can bias results high.

Target Compounds

  • non-Sulfate Particulate Matter (nSPM) -- those substances retained in the sampling nozzle/probe and on a heated filter.

Performance Tips

  • During sampling a filter is maintained at a specified temperature (320oF + 25oF)
  • DI/UF water should be used for the probe/nozzle rinses
  • Run the train isokinetically.
  • The collected filter sample is digested with DI/UF water and mixed with the probe rinse.
    • A portion of the mixed extract is analyzed for sulfate content using ion chromatography.
    • The remainder is neutralized with ammonium hydroxide (NH4OH), dried and weighed.
    • The amount of sulfate in the sample is stoichiometrically determined as ammonium sulfate [(NH4)2SO4] and is subtracted from the total particulate weight.
    • The result is reported as nonsulfate particulate matter.


  • Samples may be shipped at ambient temperatures.
  • Be sure to include a chain of custody for each shipping container.


  • This method is generally meant for emissions from Catalytic Cracking Units at Petroleum Refineries.
  • See EPA Method 5B for another method for Sulfuric Acid.


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