EPA Method 5B

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)
Do not use silicone grease - it can be soluble in the probe rinse and can bias the PM value high.
Run the train isokinetically.
Following evaporation of rinses, all samples are heated in an oven at 160oC (320oF) for six hours to volatilize any condensed sufluric acid that may have been collected.

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.

This method was originally developed for determining non-Sulfate (filterable) particulate matter from 'applicable sources' where it is called for in the applicable subparts.
Clean Air has had success in baking samples that were obtained using regular Method 5 sampling temperatures.
- First, we attempted to obtain constant weights simply with desiccation. The presence of sulfuric acid droplets prevented this.
- Next, we baked these samples at 100oC for two hours. This removed nearly 50% of the mass in that instance. But, the mass was again not quite stable.
- Next, we baked these samples at 160oC for six hours. This removed another 50% of the remaining mass. It also stabilized the mass (constant weights were attainable).