USEPA Method 202

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Determination of Condensible Particulate Emissions from Stationary Sources – USEPA Method 202

USEPA Method 202 is utilized to determine condensible particulate matter (CPM) emissions from stationary sources. It is intended to represent condensible matter as material that condenses after passing through a filter and as measured by this method. USEPA Method 202 is often used in conjunction with USEPA Method 5, 201 or 201A.

The CPM is collected in the impinger portion of a USEPA Method 17-type sampling train. The impinger contents are immediately purged after the run with nitrogen (N₂) to remove dissolved sulfur dioxide (SO₂) gases from the impinger contents. The impinger solution is then extracted with methylene chloride (MeCl₂). The organic and aqueous fractions are then taken to dryness and the residues weighed. The total of both fractions represents the CPM.

In sources that use ammonia injection as a control technique for hydrogen chloride (HCl), the ammonia interferes by reacting with HCl in the gas stream to form ammonium chloride (NH₄Cl), which would be measured as CPM. The sample is analyzed for chloride and the equivalent amount of NH₄Cl is subtracted from the CPM weight. However, if NH₄Cl is to be counted as CPM, the inorganic fraction is taken to near dryness (less than 1 ml liquid) in the oven and then allowed to air dry at ambient temperature to prevent any NH₄Cl from vaporizing.

The potential for low collection efficiency exist at oil-fired boilers. To improve the collection efficiency at these types of sources, an additional filter is placed between the second and third impinger.

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Last Update: October 25, 2006