EPA Method 5F

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.

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

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.

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